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Other Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Equity [Abstract] |  |  |
Unrealized holding gains (losses) on available for sale securities | $ (36,130) | $ 6,597 | $ 22,457
Less reclassification adjustment for gains recognized in earnings | (355) | (1,379) | (614)
Net unrealized gains | (36,485) | 5,218 | 21,843
Tax effect | 12,770 | (1,826) | (7,642)
Net-of-tax amount | (23,715) | 3,392 | 14,201
Unrealized holding gains (losses) on available for sale securities for which a portion of an other-than-temporary impairment has been recognized in earnings | 61 | 260 | (28)
Less reclassification adjustment for impairment loss recognized in earnings | 0 | 0 | 398
Net unrealized gains | 61 | 260 | 370
Tax effect | (21) | (91) | (130)
Net-of-tax amount | 40 | 169 | 240
Actuarial loss on postemployment health care plan | (219) | (578) | (757)
Net amortization of transition obligation and actuarial gain | 61 | 41 | 11
Net unrealized loss on postemployment health care plan | (158) | (537) | (746)
Tax effect | 55 | 188 | 261
Net-of-tax amount | (103) | (349) | (485)
Unrealized loss on interest rate swap | 229 | (465) | (1,205)
Less reclassification adjustment for losses recognized in earnings | 400 | 390 | 402
Net unrealized gain (loss) | 629 | (75) | (803)
Tax effect | (220) | 26 | 281
Net-of-tax amount | 409 | (49) | (522)
Total other comprehensive income (loss) | $ (23,369) | $ 3,163 | $ 13,434

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