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Investment Securities (Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value $ 62,867 $ 38,302
Less than 12 months, gross unrealized losses (697) (269)
12 months or longer, fair value 20,023 47,079
12 months or longer, gross unrealized losses (526) (769)
Total, fair value 82,890 85,381
Total, gross unrealized losses (1,223) (1,038)
Agency Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 0 3,735
Less than 12 months, gross unrealized losses 0 (20)
12 months or longer, fair value 280 0
12 months or longer, gross unrealized losses (1) 0
Total, fair value 280 3,735
Total, gross unrealized losses (1) (20)
State And Municipal Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 61,156 27,679
Less than 12 months, gross unrealized losses (690) (217)
12 months or longer, fair value 19,244 47,079
12 months or longer, gross unrealized losses (523) (769)
Total, fair value 80,400 74,758
Total, gross unrealized losses (1,213) (986)
Corporate Obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 1,711 6,888
Less than 12 months, gross unrealized losses (7) (32)
12 months or longer, fair value 499 0
12 months or longer, gross unrealized losses (2) 0
Total, fair value 2,210 6,888
Total, gross unrealized losses $ (9) $ (32)