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Impairment of Investment Securities - Cumulative Roll Forward of Credit Losses Recognized in Earnings for Debt Securities Held and Not Intended to be Sold (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Balance, beginning [1] $ 26,246 $ 27,543 $ 43,274
Credit losses on debt securities for which other-than-temporary impairment was not previously recognized 0 0 0
Additional credit losses on debt securities for which other-than- temporary impairment was previously recognized 0 0 0
Increases in cash flows expected to be collected, recognized over the remaining life of the security [2] (1,177) (1,297) (2,375)
Reduction for debt securities called during the period (218) 0 (13,356)
Balance, ending $ 24,851 $ 26,246 [1] $ 27,543 [1]
[1] The beginning balance represents credit related losses included in other-than-temporary impairment charges recognized on debt securities in prior periods.
[2] Represents the increase in cash flows recognized either as principal payments or interest income during the period.