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General - Additional Information (Detail) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 12, 2014 USD ($) Branch | Oct. 24, 2014 USD ($) Branch | Sep. 30, 2015 USD ($) State Segment Location shares | Dec. 31, 2014 USD ($) shares | Sep. 30, 2014 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of business segment | Segment |  |  | 1 |  |
Number of locations operated | Location |  |  | 62 |  |
Number of states operated | State |  |  | 4 |  |
Allocation of goodwill |  |  | $ 100,810,000 | $ 100,722,000 |
Each share convertible into shares | shares |  |  | 69 |  |
Redemption of preferred stock, shares | shares |  |  | 2,367 |  |
Redemption of preferred stock |  |  | $ 2,367,000 |  |
Series A Preferred Stock |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Dividend Rate |  |  | 6.00% |  |
Number of preferred stock converted | shares |  |  | 12,784 |  |
Redemption of preferred stock, shares | shares |  |  | 2,367 |  |
Redemption of preferred stock |  |  | $ 2,370,000 |  |
Accrued and unpaid dividends |  |  | $ 9,000 |  |
Number of Series A Noncumulative Preferred Stock Shares | shares |  |  | 0 | 15,151 | 15,151
Bank of America |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Allocation of goodwill |  | $ 1,370,000 |  |  |
Number of operating branches | Branch |  | 7 |  |  |
Deposit held on acquisition date by acquiree |  | $ 318,880,000 |  |  |
Premium on deposits acquired |  | 5,790,000 |  |  |
Loans recognized |  | $ 0 |  |  |
Bank of America | Southwestern Virginia |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating branches | Branch |  | 6 |  |  |
Bank of America | Central North Carolina |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating branches | Branch |  | 1 |  |  |
CresCom Bank |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating branches sold | Branch | 13 |  |  |  |
Deposit assumed by the buyer | $ 215,190,000 |  |  |  |
Loan assumed by the buyer | 70,040,000 |  |  |  |
Net gain on branch divestiture | 755,000 |  |  |  |
Deposit premium received | 6,450,000 |  |  |  |
Allocation of goodwill | $ 6,450,000 |  |  |  |
CresCom Bank | Southeastern, Coastal region of North Carolina |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating branches sold | Branch | 10 |  |  |  |
CresCom Bank | South Carolina |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of operating branches sold | Branch | 3 |  |  |  |

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