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Income Taxes - Summary of Differences Between the Statutory Federal Income Tax Rate and the Effective Tax Rates (Detail)
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12 Months Ended | ||
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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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| Income Tax Disclosure [Abstract] | |||
| Statutory federal tax rate | 35.00% | 35.00% | 35.00% |
| Increase (decrease) resulting from: | |||
| State taxes, net of federal tax benefit | 4.70% | 4.50% | 4.50% |
| Dividends received deduction | (1.50%) | (1.90%) | (1.40%) |
| Bank-owned life insurance | (1.80%) | (2.20%) | (2.30%) |
| Tax exempt income | (4.00%) | (3.10%) | (0.50%) |
| Other, net | 1.90% | 1.40% | 0.20% |
| Effective tax rates | 34.30% | 33.70% | 35.50% |