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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ (31,338)	$ 1,207
Net change in fair value recorded in accumulated OCI, Tax effect	(9,265)	507
Net change in fair value recorded in accumulated OCI, After-tax	(22,073)	700
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, Before-tax	(832)	(783)
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, Tax effect	(246)	(329)
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, After-tax	(586)	(454)
Net change, Before-tax	(32,170)	424
Net change, Tax effect	(9,511)	178
Other comprehensive (loss) income, net of tax	$ (22,659)	$ 246

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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.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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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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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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