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Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 446,629	$ 568,290
Less than 12 months, gross unrealized losses	(3,968)	(8,405)
12 months or longer, fair value	51,872	1,055
12 months or longer, gross unrealized losses	(982)	(14)
Total, fair value	498,501	569,345
Total, gross unrealized losses	(4,950)	(8,419)
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	5,994
Less than 12 months, gross unrealized losses	(1)
12 months or longer, fair value	0
12 months or longer, gross unrealized losses	0
Total, fair value	5,994
Total, gross unrealized losses	(1)	0
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	16,008	14,000
Less than 12 months, gross unrealized losses	(11)	(25)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	16,008	14,000
Total, gross unrealized losses	(11)	(25)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	424,627	553,629
Less than 12 months, gross unrealized losses	(3,956)	(8,377)
12 months or longer, fair value	50,881	65
12 months or longer, gross unrealized losses	(972)	(3)
Total, fair value	475,508	553,694
Total, gross unrealized losses	(4,928)	(8,380)
State and municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value		661
Less than 12 months, gross unrealized losses		(3)
12 months or longer, fair value		0
12 months or longer, gross unrealized losses		0
Total, fair value		661
Total, gross unrealized losses		(3)
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, gross unrealized losses	0	0
12 months or longer, fair value	991	990
12 months or longer, gross unrealized losses	(10)	(11)
Total, fair value	991	990
Total, gross unrealized losses	$ (10)	$ (11)

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

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