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Investment Securities (Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 73,380	$ 180,374
Less than 12 months, gross unrealized losses	(1,027)	(5,267)
12 months or longer, fair value	22,251	6,617
12 months or longer, gross unrealized losses	(823)	(304)
Total, fair value	95,631	186,991
Total, gross unrealized losses	(1,850)	(5,571)
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	3,853	3,525
Less than 12 months, gross unrealized losses	(55)	(83)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	3,853	3,525
Total, gross unrealized losses	(55)	(83)
State And Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	62,881	172,152
Less than 12 months, gross unrealized losses	(938)	(5,132)
12 months or longer, fair value	22,251	6,617
12 months or longer, gross unrealized losses	(823)	(304)
Total, fair value	85,132	178,769
Total, gross unrealized losses	(1,761)	(5,436)
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	6,646	4,697
Less than 12 months, gross unrealized losses	(34)	(52)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	6,646	4,697
Total, gross unrealized losses	$ (34)	$ (52)

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

+ References

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

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