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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Balance, beginning [1] $ 12,208 $ 17,056 $ 24,851
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] (223) (890) (1,124)
Reduction for debt securities called during the period [2] (9,164) 0 0
Balance, ending 0 12,208 [1] 17,056 [1]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Called $ 2,821 $ 3,958 $ 6,671
[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.