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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income, Included in Stockholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified |
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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| Schedule of Available-for-sale Securities [Line Items] | |||
| Net unrealized gain on securities available for sale | $ 7,416 | $ 9,063 | |
| Comprehensive income | 14,618 | 13,356 | 7,917 |
| Tax effect | (2,969) | (3,615) | |
| Net-of-tax amount | 4,447 | 5,448 | |
| Accumulated other comprehensive income | 4,104 | 4,915 | |
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Supplemental Director Retirement Plan [Member]
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Unrecognized net actuarial loss | (104) | (302) | |
| Unrecognized prior service cost | (62) | (90) | |
| Comprehensive income | (166) | (392) | |
| Tax effect | 58 | 137 | |
| Net-of-tax amount | (108) | (255) | |
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Long-Term Health Care Plan [Member]
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Unrecognized net actuarial loss | (112) | (161) | |
| Unrecognized prior service cost | (249) | (266) | |
| Comprehensive income | (361) | (427) | |
| Tax effect | 126 | 149 | |
| Net-of-tax amount | $ (235) | $ (278) | |