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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ (5,773)	$ 2,838	$ (37,111)	$ 4,045
Net change in fair value recorded in accumulated OCI, Tax effect	1,707	(1,192)	10,972	(1,699)
Net change in fair value recorded in accumulated OCI, After-tax	(4,066)	1,646	(26,139)	2,346
Amortization of unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity, Before-tax	(825)	(1,196)	(1,657)	(1,979)
Amortization of unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity, Tax effect	244	502	490	831
Amortization of unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity, After-tax	(581)	(694)	(1,167)	(1,148)
Net realized gain reclassified into earnings, Before-tax	0	(402)	0	(402)
Net realized gain reclassified into earnings, Tax Effect	0	169	0	169
Net realized gain reclassified into earnings, After-Tax	0	(233)	0	(233)
Net change, Before-tax	(6,598)	1,240	(38,768)	1,664
Net change, Tax effect	1,951	(521)	11,462	(699)
Other comprehensive income (loss), net of tax	$ (4,647)	$ 719	$ (27,306)	$ 965

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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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