| **Derivatives and Financial Instruments**                               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| **Derivative Instruments and Hedging Activities Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Derivative and Financial Instruments                                    | Derivatives and Financial InstrumentsA derivative is a financial instrument that derives its cash flows, and therefore its value, by reference to an underlying instrument, index or referenced interest rate.  These instruments include interest rate swaps, caps, floors, collars, options or other financial instruments designed to hedge exposures to interest rate risk or for speculative purposes.Accounting guidance requires an entity to recognize all derivatives as either assets or liabilities in the balance sheet, and measure those instruments at fair value.  Changes in the fair value of those derivatives are reported in current earnings or other comprehensive income depending on the purpose for which the derivative is held and whether the derivative qualifies for hedge accounting.During the fourth quarter 2009 and first quarter 2010, the Bank entered into four interest rate swaps totaling $45.0 million, using a receive-fixed swap to mitigate the exposure to changes in the fair value attributable to the benchmark interest rate (3-month LIBOR) of the hedged items (FHLB advances) from the effective date to the maturity date of the hedged instruments. As structured, the pay-variable, receive-fixed swaps are evaluated as fair value hedges and are considered highly effective. As highly effective hedges, all fair value designated hedges and the underlying hedged instrument are recorded on the balance sheet at fair value with the periodic changes of the fair value reported in the income statement. During the third quarter of 2011, the Bank terminated a $15.0 million interest swap at a gain of $0.9 million. This swap was used to hedge a FHLB advance that was terminated concurrently at a loss of $2.0 million. The gain on the swap and loss on the hedged item were netted in noninterest expense in the Consolidated Statements of Operations. The Bank is now under no additional obligations related to either this swap or the terminated FHLB advance. During the fourth quarter of 2011, the Bank terminated the remaining $30.0 million interest swaps at a gain of $0.8 million. This swap was used to hedge a FHLB advance that was terminated concurrently at a loss of $1.3 million. These swaps were used to convert fixed-rate FHLB advances to a floating interest rate. The gain on the swap and loss on the hedged item were netted in noninterest expense in the Consolidated Statements of Operations. The Bank is now under no additional obligations related to either the terminated swaps or the terminated FHLB advance. The net loss on the early termination of these advances was $1.6 million and is recorded as prepayment penalty on borrowings in the Consolidated Statements of Operations. There are no swaps hedging FHLB advances at December 31, 2013 or 2012.Mortgage banking derivatives used in the ordinary course of business consist of mandatory forward sales contracts or forward contracts and rate lock loan commitments.  The fair value of our derivative instruments is primarily measured by obtaining pricing from broker-dealers recognized to be market participants.The table below provides data about the amount of gains and losses related to derivative instruments designated as hedges included in the “Accumulated other comprehensive loss” section of “Shareholders’ Equity” on the COB’s Consolidated Balance Sheets, and in “Other income” in the COB’s Consolidated Statements of Operations:   Gain, Net of Tax Recognized in Income  For Twelve months ended(dollars in thousands) December 31, 2013 December 31, 2012 December 31, 2011Derivatives designated as hedging instruments:      Interest rate swap contracts - FHLB advances — — 819During 2012, we began originating residential mortgage loans for sale in the secondary market.  We have established guidelines in originating, selling loans to Fannie Mae, and retaining or selling the loan servicing rights.  The commitments to borrowers to originate residential mortgage loans and the forward sales commitments to investors are freestanding derivative instruments. As such, they do not qualify for hedge accounting treatment, and the fair value adjustments for these instruments is recorded through the Consolidated Statements of Operations in mortgage loan income. The fair market value of mortgage banking derivatives at December 31, 2013 was recorded in the consolidated balance sheet in Other Assets.  Gain (Loss) Recognized  For Twelve Months Ended  December 31, 2013 December 31, 2012 December 31, 2011Derivatives not designated as hedging instruments:      Mortgage loan rate lock commitments $4 $152 55Mortgage loan forward sales (218) 52 (44)Total $(214) $204 $11Discontinued OperationsOn April 7, 2009, Dover irrevocably opted to elect the fair value option for the initial and subsequent measurement for certain financial assets and liabilities on a contract-by-contract basis. This election allowed Dover to enter into a hedging arrangement for the purpose of limiting risk inherent in the closed but unlocked mortgage loan pipeline and loans held for sale portfolio.The table below provides data about the amount of gains and losses recognized in income on derivative instruments not designated as hedging instruments: (dollars in thousands) Gain/(Loss), Net of Tax Recognized in Income  For the Twelve Months Ended  December 31, 2013 December 31, 2012 December 31, 2011Derivatives not designated as hedging instruments:      Mortgage loan rate lock commitments (1) $— $— $—Mortgage loan forward sales and MBS (1) — — (44)Total $— $— $(44) (1)Recognized in “Net loss from discontinued operations” in the Company’s Consolidated Statements of Operations.Dover originated certain residential mortgage loans with the intention of selling these loans. Between the time that Dover entered into an interest rate lock or a commitment to originate a residential mortgage loan with a potential borrower and the time the closed loan is sold, COB was subject to variability in market prices related to these commitments. COB believed that it was prudent to limit the variability of expected proceeds from the future sales of these loans by entering into forward sales commitments and commitments to deliver loans into a mortgage-backed security. The commitments to originate residential mortgage loans and the forward sales commitments were freestanding derivative instruments. They did not qualify for hedge accounting treatment so their fair value adjustments were recorded through the income statement in income from mortgage loan sales. |

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| - Definition
The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.
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