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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Summary Of Significant Accounting Policies [Line Items] | |||
| Reserve | $ 2,436,000 | $ 15,322,000 | |
| Federal fund sold period | 1 day | ||
| Mortgage loans maturity date | 60 days | ||
| Interest rate lock commitment derivatives | 98,000 | 79,000 | |
| Income recognized | $ 18,000 | $ 79,000 | |
| Anti-dilutive potential common shares are excluded from the diluted earnings per share computation | 30,000 | 30,000 | |
| Minimum [Member] | |||
| Summary Of Significant Accounting Policies [Line Items] | |||
| Estimated useful life of Intangible assets | 3 years | ||
| Maximum [Member] | |||
| Summary Of Significant Accounting Policies [Line Items] | |||
| Estimated useful life of Intangible assets | 10 years | ||