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Income Taxes - Summary of Tax Effects of Each Item that Give Rise to Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Income Tax Disclosure [Abstract] | ||
| Net unrealized gain on securities available for sale | $ (2,969) | $ (3,615) |
| Depreciation and amortization | (902) | (1,293) |
| Other-than-temporary impairment losses | 97 | 97 |
| Allowance for loan losses | 10,349 | 8,376 |
| Employee benefit and retirement plans | 3,687 | 3,102 |
| Acquisition accounting | 2,362 | 2,581 |
| Other, net | 854 | 462 |
| Net deferred tax asset | $ 13,478 | $ 9,710 |