|**Shareholders' Equity**                                            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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|**Stockholders' Equity Note [Abstract]**                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Stockholders' Equity                                                | Shareholders’ EquityEarnings per ShareCOB filed articles of amendment to its articles of incorporation on October 31, 2011 to effect a one-for-one hundred reverse stock split (the “Reverse Stock Split”) of its common stock. The amendment became effective following the close of trading on October 31, 2011. A purpose of the Reverse Stock Split is to increase the per share trading price of COB's common stock to satisfy the$1.00minimum bid price requirement for continued listing on The Nasdaq Capital Market. As a result of the Reverse Stock Split, every100shares of COB's common stock issued and outstanding prior to the opening of trading on November 1, 2011 were consolidated into one issued and outstanding share. No fractional shares were issued as a result of the Reverse Stock Split. Instead, any fractional share resulting from the Reverse Stock Split was rounded up to the next largest whole share. All share and per share amounts have been retroactively adjusted in the financial statements and footnotes to account for the impact of the Reverse Stock Split.Basic net loss per share, or basic earnings (loss) per share (“EPS”), is computed by dividing net loss to common shareholders by the weighted average number of common shares outstanding for the period.During the years endedDecember 31, 2013and December 31, 2012, COB hadnopreferred stock outstanding.  During the year endedDecember 31, 2011, and in order the complete the Recapitalization, COB paid dividends and deferred interest of approximately$4.5 millionon Series A preferred stock, in addition to the$0.6 millionaccretion of the discount on the preferred stock. AtDecember 31, 2013andDecember 31, 2012, COB had no unpaid cumulative dividends.The following table represents the impact of preferred stock activity on the Consolidated Statement of Operations for the years endedDecember 31, 2013,2012, and2011:(dollars in thousands)December 31,201320122011Gain on the retirement of Series A preferred stock$—$—$38,625Gain on retirement of Bank preferred stock——9,375Total gain on the retirement of preferred stock——48,000Dividends and accretion on Series A preferred stock——(2,652)Dividends on Bank preferred stock——(756)Total dividends on preferred stock——(3,408)Preferred stock gain on retirement, net of accretion, and dividends$—$—$44,592Diluted EPS reflects the potential dilution that could occur if COB’s potential common stock, which consists of dilutive stock options and a common stock warrant held by the U.S. Treasury, were issued. As required for entities with complex capital structures, a dual presentation of basic and diluted EPS is included on the face of the income statement.Due to a net loss for the twelve month periods endedDecember 31, 2013,2012and2011; all stock options and the common stock warrant were considered antidilutive and thus are not included in this calculation. Additionally, for the periods endedDecember 31, 2013,December 31, 2012andDecember 31, 2011,  there were22,713,23,197and24,818antidilutive shares, respectively. Of the antidilutive shares, the number of shares relating to stock options were641atDecember 31, 2013,1,125atDecember 31, 2012, and2,746atDecember 31, 2011. Average antidilutive shares relating to the common stock warrant were22,072for each of the three years. Because the exercise price exceeded the average market price for the periods discussed and because of the net loss, the stock options and common stock warrant were omitted from the calculation of diluted earnings per share for their respective periods.Stock Based CompensationFor the years endedDecember 31, 2013,2012and2011, COB hadfiveshare-based compensation plans in effect. The compensation expense charged against income for those plans was$653,000,$3,000, and$23,000, respectively, and the related income tax benefit was$250,000,$1,000and$9,000, respectively.On June 21, 2012, COB shareholders approved the FNB 2012 Incentive Plan.  The 2012 Incentive Plan, which was intended to replace the 2003 plan, provides for the grant of stock options, restricted stock and other stock-based awards, as well as cash-based performance awards.  An amended and restated Incentive Plan was approved by the shareholders on June 20, 2013. As amended, a total of1,800,000shares have been authorized for issuance under the 2012 Incentive Plan, and the maximum number of shares of COB common stock with respect to which an employee may be granted awards under the 2012 Incentive Plan during any calendar year period is100,000shares.  On December 28, 2012, a total of110,059shares of long-term restricted stock were granted pursuant to the 2012 Incentive Plan to the topsixofficers of COB and during 2013, a total of158,302shares of restricted stock were issued to the samesixofficers,eightof the nine non-executive directors, and a larger group of employees pursuant to the same plan. In each case such shares were valued at the closing price of COB common stock on the grant date.COB adopted stock compensation plans in 1993 and 2003 that allow for the granting of incentive and nonqualified stock options to key employees and directors. The 2003 stock compensation plan also allows for the granting of restricted stock. Under terms of both the 1993 and 2003 plans, options are granted at prices equal to the fair market value of the common stock on the date of grant. Options become exercisable afterone yearin equal, cumulative installments over afive-year period. No option shall expire later thanten yearsfrom the date of grant.Nofurther grants can be made under the 1993 stock compensation plan after March 10, 2003. Based on the stock options outstanding atDecember 31, 2013, no shares of common stock have been reserved for issuance under the 1993 stock compensation plan. No shares of common stock has been reserved for issuance under the 2003 stock compensation plan. AtDecember 31, 2013, there were no shares available under the 2003 plan for the granting of additional options or stock awards.With the completion of the Merger, each outstanding option to purchase shares of Granite Corp. common stock, whether or not exercisable, was converted into options to purchase COB common stock. After adjusting for the Reverse Stock Split and rounding up to the nearest whole share, there were78stock options assumed from Granite Corp. All of those options expired during2012, andnoneremain exercisable atDecember 31, 2013.COB assumedthreestock compensation plans in its acquisition of Integrity Financial Corporation in 2006. Qualified and nonqualified stock options are outstanding under these plans for grants issued from 1997 to 2004 to key employees and directors at a price equal to fair market value on the date of grant.Noadditional grants will be made under these plans. Based on the stock options outstanding atDecember 31, 2013, no shares of common stock have been reserved for issuance under these stock compensation plans.The fair market value of each option award is estimated on the date of grant using the Black-Scholes option pricing model. The risk-free interest rate is based on a U.S. Treasury instrument with a life that is similar to the expected life of the option grant. Expected volatility is based on the historical volatility of the COB’s common stock over approximately the previous6years, except for the options granted in 2013, which are based on the historical volatility of COB's common stock since July 1, 2012. The expected life of the options has historically been considered to be approximately6 years. The expected dividend yield is based upon the current yield in effect at the date of grant. There were54,060options granted to employees during 2013 with a risk-free rate of2.60%, a historical volatility of29.60%and an expected dividend yield of0%. The fair value of options granted during 2013 was$3.27. There werenostock options granted in2012or2011, respectively.The following is a summary of stock option activity:For the Years Ended December 31,201320122011SharesWeightedAverageExercisePriceSharesWeightedAverageExercisePriceSharesWeightedAverageExercisePriceOutstanding at beginning of year1,125$1,963.292,742$1,821.793,658$1,857.00Granted54,0607.86————Assumed————78267.53Exercised——————Forfeited or expired(484)2,156.98(1,617)1,723.34(994)1,829.09Outstanding at end of year54,70129.061,1251,963.292,7421,821.79Options exercisable at end of year6411,817.041,1251,963.292,7111,825.85AtDecember 31, 2013, information concerning stock options outstanding and exercisable is as follows:Options OutstandingOptions ExercisableRange of Exercise PricesSharesWeightedAverageRemainingContractualLife (Years)WeightedAverageExercisePriceNumberExercisableWeightedAverageRemainingContractualLife (Years)WeightedAverageExercisePrice$1 - $1054,0609.29$7.86——$—$1,350 - $1,6201811.151,440.741811.151,440.74$1,621 - $1,890303.001,723.00303.001,723.00$1,891 - $2,1604300.961,982.004300.961,982.00In2013,2012and2011, there wasnointrinsic value of options exercised, and the grant-date fair value of options vested was$0in each of the three years. There werenooptions exercised in2013.The following is a summary of non-vested restricted stock activity:For the Years Ended December 31,20132012SharesWeightedAverageGrant DateFair ValueSharesWeightedAverageGrant DateFair ValueNon-vested at beginning of year110,059$11.134$260.00Granted158,30210.71110,05911.13Vested——(4)260.00Forfeited or expired————Non-vested at end of year268,361$12.68110,059$11.13The fair value of restricted stock vested in2013,2012and 2011 was$0,$1,040, and$1,040respectively.On December 19, 2013, a total of158,302shares of restricted stock were granted by the COB Board of Directors to the same six officers, eight of the nine non-executive directors, and a larger group of employees.  The awards to the six officers constituted long-term restricted stock, some of which were time vesting only, with 2/3rds of the stock vesting on the second anniversary of the date of grant and the final 1/3 vesting on the third anniversary of the date of grant, and a portion of which also require COB common stock to reach a certain stock price target.  The awards to the directors constituted restricted stock, some of which were time vesting only, with 1/3 of the stock vesting on the first anniversary of the date of grant, the second 1/3 vesting on the second anniversary of the date of grant, and the final 1/3 vesting on the third anniversary of the date of grant, and a portion of which also require COB common stock to reach a certain stock price target. The awards to the larger group of employees vest over time, with 1/4 of the stock vesting on each of the first, second, third and fourth anniversary of the date of the grant. On December 28, 2012, a total of110,059shares of long-term restricted stock were granted by the COB Board of Directors to the top six officers of COB at the closing price of COB common stock on the grant date.  Under  the terms of the awards, 2/3rds of the restricted stock vests on the later of the lifting of the Consent Orders or the second anniversary of the date of grant and the final 1/3rdof the stock vesting on the later of the lifting of the Consent Order or the third anniversary of the date of grant.  As indicated previously, all of the Consent Orders have been lifted.As ofDecember 31, 2013, unrecognized compensation cost related to non-vested share-based compensation arrangements granted under COB’s stock benefit plans totaled$2.5 million, which will be fully recognized by December 2016.COB funds the option shares and restricted stock from authorized but unissued shares. COB does not typically purchase shares to fulfill the obligations of the stock benefit plans. COB’s policy does allow option holders under certain plans to exercise options with seasoned shares.
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|(dollars in thousands)                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Gain on the retirement of Series A preferred stock                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Gain on retirement of Bank preferred stock                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total gain on the retirement of preferred stock                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Dividends and accretion on Series A preferred stock                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Dividends on Bank preferred stock                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total dividends on preferred stock                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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|                                                                   
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