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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
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 111,250 $ 196,901
Less than 12 Months, Unrealized Loss (705) (2,419)
12 Months or More, Fair Value 63,227 64,882
12 Months or More, Unrealized Loss (1,923) (3,120)
Total, Fair Value 174,477 261,783
Total, Unrealized Loss (2,628) (5,539)
U.S. Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 59,087 90,380
Less than 12 Months, Unrealized Loss (174) (579)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 59,087 90,380
Total, Unrealized Loss (174) (579)
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 5,866 32,353
Less than 12 Months, Unrealized Loss (86) (448)
12 Months or More, Fair Value 272 264
12 Months or More, Unrealized Loss (193) (201)
Total, Fair Value 6,138 32,617
Total, Unrealized Loss (279) (649)
Residential and Multi-Family Mortgage [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 41,306 65,598
Less than 12 Months, Unrealized Loss (376) (1,255)
12 Months or More, Fair Value 33,844 34,611
12 Months or More, Unrealized Loss (656) (1,127)
Total, Fair Value 75,150 100,209
Total, Unrealized Loss (1,032) (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 8,993 8,476
12 Months or More, Unrealized Loss (500) (951)
Total, Fair Value 8,993 10,565
Total, Unrealized Loss (500) (962)
Pooled SBA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,991 6,481
Less than 12 Months, Unrealized Loss (69) (126)
12 Months or More, Fair Value 19,146 20,560
12 Months or More, Unrealized Loss (526) (792)
Total, Fair Value 24,137 27,041
Total, Unrealized Loss (595) (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 972 971
12 Months or More, Unrealized Loss (48) (49)
Total, Fair Value 972 971
Total, Unrealized Loss $ (48) $ (49)