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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
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 183,049 $ 196,901
Less than 12 Months, Unrealized Loss (1,872) (2,419)
12 Months or More, Fair Value 65,593 64,882
12 Months or More, Unrealized Loss (2,712) (3,120)
Total, Fair Value 248,642 261,783
Total, Unrealized Loss (4,584) (5,539)
U.S. Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 97,931 90,380
Less than 12 Months, Unrealized Loss (470) (579)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 97,931 90,380
Total, Unrealized Loss (470) (579)
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 19,185 32,353
Less than 12 Months, Unrealized Loss (328) (448)
12 Months or More, Fair Value 266 264
12 Months or More, Unrealized Loss (199) (201)
Total, Fair Value 19,451 32,617
Total, Unrealized Loss (527) (649)
Residential and Multi-Family Mortgage [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 57,665 65,598
Less than 12 Months, Unrealized Loss (947) (1,255)
12 Months or More, Fair Value 35,535 34,611
12 Months or More, Unrealized Loss (883) (1,127)
Total, Fair Value 93,200 100,209
Total, Unrealized Loss (1,830) (2,382)
Corporate Notes and Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 1,998 2,089
Less than 12 Months, Unrealized Loss (2) (11)
12 Months or More, Fair Value 8,624 8,476
12 Months or More, Unrealized Loss (825) (951)
Total, Fair Value 10,622 10,565
Total, Unrealized Loss (827) (962)
Pooled SBA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 6,270 6,481
Less than 12 Months, Unrealized Loss (125) (126)
12 Months or More, Fair Value 20,201 20,560
12 Months or More, Unrealized Loss (752) (792)
Total, Fair Value 26,471 27,041
Total, Unrealized Loss (877) (918)
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 967 971
12 Months or More, Unrealized Loss (53) (49)
Total, Fair Value 967 971
Total, Unrealized Loss $ (53) $ (49)