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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
After-tax:
Other comprehensive income (loss), net of taxes	$ (17,618)	$ 28,374	$ (4,748)
Net changes related to available-for-sale securities [Member]
OCI, Pre-tax:
Pre-tax, Unrealized holding gains (losses) arising during the period	33,575	38,129	(9,111)
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income	(56,914)	(492)	2,803
Pre-tax, Other comprehensive income (loss)	(23,339)	37,637	(6,308)
OCI, Tax:
Tax, Unrealized holding gains (losses) arising during the period	7,884	9,384	(2,254)
Tax, Less: Reclassification adjustments (gains) losses realized in net income	(13,605)	(121)	694
Tax, Other comprehensive income (loss)	(5,721)	9,263	(1,560)
After-tax:
After-tax, Unrealized holding gains (losses) arising during the period	25,691	28,745	(6,857)
After-tax, Less: Reclassification adjustments (gains) losses realized in net income	(43,309)	(371)	2,109
Other comprehensive income (loss), net of taxes	(17,618)	28,374	(4,748)
Net changes related to available-for-sale securities [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
OCI, Pre-tax:
Pre-tax, Less: Reclassification adjustments (gains) losses realized in net income	791	0	5,830
OCI, Tax:
Tax, Less: Reclassification adjustments (gains) losses realized in net income	194	0	2,811
After-tax:
After-tax, Less: Reclassification adjustments (gains) losses realized in net income	597	0	3,019
Net changes related to available-for-sale securities [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
OCI, Pre-tax:
Pre-tax, Other comprehensive income (loss)	(22,548)	37,637	(478)
OCI, Tax:
Tax, Other comprehensive income (loss)	(5,527)	9,263	1,251
After-tax:
Other comprehensive income (loss), net of taxes	$ (17,021)	$ 28,374	$ (1,729)

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