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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Equity [Abstract]        
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax $ (1,654) $ 3,366 $ 467 $ 4,450
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax (110) (3,950) (281) (4,852)
Net current period other comprehensive income (loss), Pre-tax (1,764) (584) 186 (402)
Net unrealized gains (losses) on investments available for sale arising during the period, Tax (638) 1,299 180 1,717
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax (43) (1,524) (108) (1,872)
Net current period other comprehensive income (loss), Tax (681) (225) 72 (155)
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax (1,016) 2,067 287 2,733
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax (67) (2,426) (173) (2,980)
Net current period other comprehensive income (loss), After-tax $ (1,083) $ (359) $ 114 $ (247)