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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
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 92,037 $ 196,901
Less than 12 Months, Unrealized Loss (580) (2,419)
12 Months or More, Fair Value 77,951 64,882
12 Months or More, Unrealized Loss (2,182) (3,120)
Total, Fair Value 169,988 261,783
Total, Unrealized Loss (2,762) (5,539)
U.S. Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 50,112 90,380
Less than 12 Months, Unrealized Loss (204) (579)
12 Months or More, Fair Value 3,398 0
12 Months or More, Unrealized Loss (2) 0
Total, Fair Value 53,510 90,380
Total, Unrealized Loss (206) (579)
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 3,562 32,353
Less than 12 Months, Unrealized Loss (50) (448)
12 Months or More, Fair Value 1,524 264
12 Months or More, Unrealized Loss (216) (201)
Total, Fair Value 5,086 32,617
Total, Unrealized Loss (266) (649)
Residential and Multi-Family Mortgage [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 33,692 65,598
Less than 12 Months, Unrealized Loss (259) (1,255)
12 Months or More, Fair Value 44,212 34,611
12 Months or More, Unrealized Loss (935) (1,127)
Total, Fair Value 77,904 100,209
Total, Unrealized Loss (1,194) (2,382)
Corporate Notes and Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 2,089
Less than 12 Months, Unrealized Loss 0 (11)
12 Months or More, Fair Value 9,068 8,476
12 Months or More, Unrealized Loss (426) (951)
Total, Fair Value 9,068 10,565
Total, Unrealized Loss (426) (962)
Pooled SBA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,671 6,481
Less than 12 Months, Unrealized Loss (67) (126)
12 Months or More, Fair Value 18,780 20,560
12 Months or More, Unrealized Loss (552) (792)
Total, Fair Value 23,451 27,041
Total, Unrealized Loss (619) (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 969 971
12 Months or More, Unrealized Loss (51) (49)
Total, Fair Value 969 971
Total, Unrealized Loss $ (51) $ (49)