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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ (26,435)	$ (11,336)	$ (15,792)
Net change in fair value recorded in accumulated OCI, Tax effect	7,815	4,760	6,633
Net change in fair value recorded in accumulated OCI, After-tax	(18,620)	(6,576)	(9,159)
Amortization of unrealized (gains)/ losses on securities transferred from available-for-sale to held-to-maturity, Before-tax	(2,091)	(3,293)	(2,174)
Amortization of unrealized (gains)/ losses on securities transferred from available-for-sale to held-to-maturity, Tax effect	619	1,383	913
Amortization of unrealized (gains)/ losses on securities transferred from available-for-sale to held-to-maturity, After-tax	(1,472)	(1,910)	(1,261)
Net realized (gain)/loss reclassified into earnings, Before-tax	0	(402)	(548)
Net realized (gain)/loss reclassified into earnings, Tax Effect	0	169	230
Net realized (gain)/loss reclassified into earnings, After-Tax	0	(233)	(318)
Net change, Before-tax	(28,526)	(15,031)	(18,514)
Net change, Tax effect	(8,434)	(6,312)	(7,776)
Net change, After-tax	$ (20,092)	$ (8,719)	$ (10,738)

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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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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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