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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ 19,350	$ (31,338)
Net change in fair value recorded in accumulated OCI, Tax effect	(5,720)	9,265
Net change in fair value recorded in accumulated OCI, After-tax	13,630	(22,073)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax	(1,123)	(832)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect	332	246
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax	(791)	(586)
Net change, Before-tax	18,227	(32,170)
Net change, Tax effect	(5,388)	9,511
Net change, After-tax	$ 12,839	$ (22,659)

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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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Amount after tax and 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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Amount of tax expense (benefit), 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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