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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ 19,564	$ (5,773)	$ 38,914	$ (37,111)
Net change in fair value recorded in accumulated OCI, Tax effect	(5,784)	1,707	(11,504)	10,972
Net change in fair value recorded in accumulated OCI, After-tax	13,780	(4,066)	27,410	(26,139)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax	(78)	(825)	(1,201)	(1,657)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect	23	244	355	490
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax	(55)	(581)	(846)	(1,167)
Net change, Before-tax	19,486	(6,598)	37,713	(38,768)
Net change, Tax effect	(5,761)	1,951	(11,149)	11,462
Net change, After-tax	$ 13,725	$ (4,647)	$ 26,564	$ (27,306)

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- Definition

Other comprehensive income (loss) amortization of unrealized gain (loss) on securities transferred from available for sale to held to maturity before tax.

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Other comprehensive income (loss) amortization of unrealized gain (loss) on securities transferred from available for sale to held to maturity net of tax.

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Other comprehensive income (loss) amortization of unrealized gain (loss) on securities transferred from available for sale to held to maturity tax.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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