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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
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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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