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Securities - Securities with Unrealized Losses Aggregated by Investment Category and Length of Time that Individual Securities have been in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 152,344 $ 117,835
Less than 12 Months, Unrealized Loss (2,466) (961)
12 Months or More, Fair Value 121,004 240,321
12 Months or More, Unrealized Loss (4,516) (7,543)
Total, Fair Value 273,348 358,156
Total, Unrealized Loss (6,982) (8,504)
U.S. Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 65,675 26,069
Less than 12 Months, Unrealized Loss (640) (149)
12 Months or More, Fair Value 31,923 85,016
12 Months or More, Unrealized Loss (488) (2,070)
Total, Fair Value 97,598 111,085
Total, Unrealized Loss (1,128) (2,219)
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 9,103 16,398
Less than 12 Months, Unrealized Loss (234) (179)
12 Months or More, Fair Value 2,478 12,363
12 Months or More, Unrealized Loss (9) (223)
Total, Fair Value 11,581 28,761
Total, Unrealized Loss (243) (402)
Residential and Multi-Family Mortgage [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 69,631 70,360
Less than 12 Months, Unrealized Loss (1,562) (603)
12 Months or More, Fair Value 50,351 99,397
12 Months or More, Unrealized Loss (1,832) (2,202)
Total, Fair Value 119,982 169,757
Total, Unrealized Loss (3,394) (2,805)
Corporate Notes and Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 5,027 5,008
Less than 12 Months, Unrealized Loss (2) (30)
12 Months or More, Fair Value 8,144 7,935
12 Months or More, Unrealized Loss (1,269) (1,470)
Total, Fair Value 13,171 12,943
Total, Unrealized Loss (1,271) (1,500)
Pooled SBA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 2,908 0
Less than 12 Months, Unrealized Loss (28) 0
12 Months or More, Fair Value 27,127 34,608
12 Months or More, Unrealized Loss (879) (1,560)
Total, Fair Value 30,035 34,608
Total, Unrealized Loss (907) (1,560)
Other Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Loss 0 0
12 Months or More, Fair Value 981 1,002
12 Months or More, Unrealized Loss (39) (18)
Total, Fair Value 981 1,002
Total, Unrealized Loss $ (39) $ (18)