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General - Additional Information (Detail) (USD $) | 9 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 9 Months Ended |  |
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Sep. 30, 2014 Segment | Dec. 31, 2013 | Aug. 06, 2014 CresCom Bank Branch | Aug. 06, 2014 CresCom Bank | Aug. 06, 2014 CresCom Bank North Carolina Branch | Aug. 06, 2014 CresCom Bank South Carolina Branch | Oct. 24, 2014 Subsequent Event Bank of America Branch | Oct. 24, 2014 Subsequent Event Bank of America | Oct. 24, 2014 Subsequent Event Bank of America Southwestern Virginia Branch | Oct. 24, 2014 Subsequent Event Bank of America North Carolina Branch | Sep. 30, 2014 Series A Preferred Stock | Dec. 31, 2013 Series A Preferred Stock | Sep. 30, 2013 Series A Preferred Stock
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business segment | 1 |  |  |  |  |  |  |  |  |  |  |  |
Number of branches acquired |  |  |  |  |  |  | 7 |  | 6 | 1 |  |  |
Deposit held on acquisition date by acquiree |  |  |  |  |  |  |  | $ 318,000,000 |  |  |  |  |
Number of branches sold |  |  | 13 |  | 10 | 3 |  |  |  |  |  |  |
Total deposit of branches to be sold | 1,932,275,000 | 1,950,742,000 |  | 230,000,000 |  |  |  |  |  |  |  |  |
Total loans of branches to be sold | $ 1,741,633,000 | $ 1,686,644,000 |  | $ 59,000,000 |  |  |  |  |  |  |  |  |
Dividend Rate |  |  |  |  |  |  |  |  |  |  | 6.00% |  |
Each share convertible into shares | 69 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption date | May 20, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Number of Series A Noncumulative Preferred Stock Shares |  |  |  |  |  |  |  |  |  |  | 15,151 | 15,251 | 15,471

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