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Securities Available for Sale - Disclosure on Securities Available for Sale with Temporary Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 432,752	$ 568,290
12 months or longer, fair value	243,044	1,055
Total, fair value	675,796	569,345
Less than 12 months, gross unrealized losses	(3,944)	(8,405)
12 months or longer, gross unrealized losses	(6,172)	(14)
Total, gross unrealized losses	(10,116)	(8,419)
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	12,006	14,000
12 months or longer, fair value	6,999	0
Total, fair value	19,005	14,000
Less than 12 months, gross unrealized losses	(8)	(25)
12 months or longer, gross unrealized losses	(1)	0
Total, gross unrealized losses	(9)	(25)
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	420,746	553,629
12 months or longer, fair value	235,056	65
Total, fair value	655,802	553,694
Less than 12 months, gross unrealized losses	(3,936)	(8,377)
12 months or longer, gross unrealized losses	(6,159)	(3)
Total, gross unrealized losses	(10,095)	(8,380)
State and municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value		661
12 months or longer, fair value		0
Total, fair value		661
Less than 12 months, gross unrealized losses		(3)
12 months or longer, gross unrealized losses		0
Total, gross unrealized losses		(3)
Corporate obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	0	0
12 months or longer, fair value	989	990
Total, fair value	989	990
Less than 12 months, gross unrealized losses	0
12 months or longer, gross unrealized losses	(12)	(11)
Total, gross unrealized losses	$ (12)	$ (11)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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+ References

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