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Selected Quarterly Consolidated Financial Information (Unaudited) - Selected Quarterly Financial Data Consolidated Financial Statements (Parenthetical) (Detail) (USD $)
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0 Months Ended | 3 Months Ended | 12 Months Ended | ||||
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Jun. 08, 2012
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information Disclosure [Abstract] | |||||||
| Gain on sale of investment in affiliate bank | $ 4,800,000 | $ 4,800,000 | $ 4,819,000 | ||||
| Non-interest expense | 1,500,000 | ||||||
| occupancy and equipment expenses | 172,000 | ||||||
| marketing and advertising expenses | 368,000 | ||||||
| professional services expenses | 264,000 | ||||||
| foreclosed real estate expenses | 349,000 | ||||||
| other general and administrative expenses | $ 268,000 | ||||||