| **Investment Securities**                              | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Investments, Debt and Equity Securities [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Investment Securities                                  | Investment SecuritiesSecurities designated as available-for-sale are carried at fair value.  However, the unrealized difference between amortized cost and fair value of securities available-for-sale is excluded from net income unless there is an other than temporary impairment and is reported, net of deferred taxes, as a component of shareholders' equity as accumulated other comprehensive income (loss).  Securities held-to-maturity are carried at amortized cost, as the bank has the ability, and management has the positive intent, to hold these securities to maturity.  Premiums and discounts on securities are amortized and accreted according to the interest method.Our primary objective in managing the investment portfolio is to maintain a portfolio of high quality, highly liquid investments yielding competitive returns.  We are required under federal regulations to maintain adequate liquidity to ensure safe and sound operations.  We maintain investment balances based on a continuing assessment of cash flows, the level of loan production, current interest rate risk strategies and an assessment of the potential future direction of market interest rate changes.  Investment securities differ in terms of default, interest rate, liquidity and expected rate of return risks.The following table summarizes the amortized cost and estimated fair value of investment securities and presents the related gross unrealized gains and losses:September 30, 2013        (dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair ValueAvailable for Sale:        Obligations of:        U.S. government sponsored enterprises $2,057 $25 $— $2,082Residential mortgage-backed securities-GSE 373,860 945 17,358 357,447Residential mortgage-backed securities-Private 20,484 784 10 21,258Commercial mortgage backed securities-GSE 22,863 — 1,219 21,644Commercial mortgage-backed securities-Private 10,419 — 786 9,633Business Development Company investment 1,753 887 — 2,640Corporate notes 24,874 134 — 25,008Total available for sale $456,310 $2,775 $19,373 $439,712Held to Maturity:        Residential mortgage-backed securities-GSE 143,611 — 6,556 137,055Commercial mortgage-backed securities-Private 10,073 — 654 9,419     Total held to maturity $153,684 $— $7,210 $146,474Total investment securities $609,994 $2,775 $26,583 $586,186         December 31, 2012        (dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair ValueAvailable for Sale:        Obligations of:        U.S. Treasury and government agencies $6,646 $335 $— $6,981U.S. government sponsored enterprises 22,118 55 — 22,173States and political subdivisions 5,918 120 — 6,038Residential mortgage-backed securities-GSE 436,344 5,678 948 441,074Residential mortgage-backed securities-Private 22,649 750 454 22,945Commercial mortgage backed securities-GSE 23,150 209 — 23,359Commercial mortgage backed securities-Private 5,283 34 — 5,317Corporate notes 36,710 270 17 36,963Total $558,818 $7,451 $1,419 $564,850As a member of the Federal Home Loan Bank of Atlanta (“FHLB”), the Bank is required to own capital stock in the FHLB based generally upon the balances of total assets and FHLB advances.  FHLB capital stock is pledged to secure FHLB advances.  This investment is carried at cost since no ready market exists for FHLB stock and there is no quoted market value.  However, redemption of this stock has historically been at par value.  The Bank owned a total of $5.9 million of FHLB stock at September 30, 2013 and $6.3 million at December 31, 2012.  Due to the redemption provisions of FHLB stock, we have estimated that fair value approximated cost and that this investment was not impaired at September 30, 2013.  FHLB stock is included in other assets at its original cost basis.As a member bank of the Federal Reserve Bank of Richmond (“FRBR”), the Bank also is required to own capital stock of the FRBR based upon a percentage of the bank's common stock and surplus.  This investment is carried at cost since no ready market exists for FRBR stock and there is no quoted market value.  At September 30, 2013 and December 31, 2012, the Bank owned a total of $4.1 million and $3.1 million of FRBR stock, respectively.  Due to the nature of this investment in an entity of the U.S. government, we have estimated that fair value approximated the cost and that this investment was not impaired at September 30, 2013.  FRBR stock is included in other assets at its original cost basis.At September 30, 2013, $94.1 million of the investment securities portfolio was pledged to secure public deposits, $18.4 million was pledged to retail repurchase agreements and $78.9 million was pledged to others, leaving $394.1 million available as lendable collateral.During the three and nine months ended September 30, 2013, the Bank sold securities with a book value of  $3.3 million and $175.1 million respectively, and recognized gains of $0.1 million and $2.8 million, respectively. During the three and nine months ended September 30, 2012, the Bank sold securities with a book value of $21.4 million and $134.1 million respectively, and recognized a loss of $(33) thousand, and a gain of $1.9 million, respectively. The Bank sold these securities in order to manage our interest rate sensitivity profile.The following tables show our investments' estimated fair value and gross unrealized losses, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at September 30, 2013 and December 31, 2012.  The change in unrealized losses during the three and nine month periods ending September 30, 2013 was attributed to changes in interest rates and not to changes in the credit quality of these securities. All unrealized losses on investment securities are considered by management to be temporary given the credit quality of these investment securities or the short duration of the unrealized loss, or both. Less than 12 Months 12 Months or More Total(dollars in thousands)Estimated Fair ValueGross Unrealized Losses Estimated Fair ValueGross Unrealized Losses Estimated Fair ValueGross Unrealized LossesSeptember 30, 2013        Available for Sale:        Residential mortgage-backed securities-GSE$312,145$17,358 $—$— $312,145$17,358Residential mortgage-backed securities-Private1,35010 —— 1,35010Commercial mortgage-backed securities-GSE21,6441,219 —— 21,6441,219Commercial mortgage-backed securities-Private9,633786 —— 9,633786Total available for sale$344,772$19,373 $—$— $344,772$19,373Held to Maturity:        Residential mortgage-backed securities-GSE$137,055$6,556 $—$— $137,055$6,556Commercial mortgage-backed securities-Private9,419654 —— 9,419654Total held to maturity$146,474$7,210 $—$— $146,474$7,210Total$491,246$26,583 $—$— $491,246$26,583         December 31, 2012        Obligations of:        Residential mortgage-backed securities-GSE$123,489$904 $7,027$44 $130,516$948Residential mortgage-backed securities-Private7,499454 —— 7,499454Corporate notes3,24917 —— 3,24917Total$134,237$1,375 $7,027$44 $141,264$1,419At September 30, 2013 and December 31, 2012, there were zero and four available-for-sale securities that were in an unrealized loss position for longer than 12 months, respectively.If an entity has a debt security that has been in a loss position for over 12 months and it cannot assert it is more likely than not that it will not have to sell the security before recovery, then other than temporary impairment ("OTTI") must be taken.  The amount of impairment is bifurcated between impairment due to credit (which is recorded through earnings) and noncredit impairment (which becomes a component of other comprehensive income (“OCI”) for both available-for-sale and held-to-maturity securities).  For held-to-maturity securities, the amount in OCI will be amortized prospectively over the security's remaining life. After analyzing our securities portfolio at September 30, 2013, and after considering ratings, fair value, cash flows and other factors,  we did not have any OTTI during the three or nine months ended September 30, 2013 and September 30, 2012.The aggregate amortized cost and fair value of securities at September 30, 2013, by remaining contractual maturity, are shown in the following table.  Actual expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  Available-for-Sale Held-to-Maturity(dollars in thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair ValueDue in one year or less $16,486 $16,539 $— $—Due after one year through five years 10,445 10,551 — —With no stated maturity 1,753 2,640 — —Total 28,684 29,730 — —Mortgage-backed securities 427,626 409,982 153,684 146,474Total $456,310 $439,712 $153,684 $146,474 |

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| - Definition
The entire disclosure for  investments in certain debt and equity securities.
+ References
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