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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, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 187,610 $ 106,735
Less than 12 Months, Unrealized Loss (2,736) (771)
12 Months or More, Fair Value 129,911 134,831
12 Months or More, Unrealized Loss (4,894) (3,428)
Total, Fair Value 317,521 241,566
Total, Unrealized Loss (7,630) (4,199)
U.S. Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 63,833 55,696
Less than 12 Months, Unrealized Loss (1,262) (540)
12 Months or More, Fair Value 34,590 34,754
12 Months or More, Unrealized Loss (492) (368)
Total, Fair Value 98,423 90,450
Total, Unrealized Loss (1,754) (908)
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 61,022 15,890
Less than 12 Months, Unrealized Loss (456) (69)
12 Months or More, Fair Value 4,045 4,104
12 Months or More, Unrealized Loss (302) (245)
Total, Fair Value 65,067 19,994
Total, Unrealized Loss (758) (314)
Residential and Multi-Family Mortgage [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 50,017 30,144
Less than 12 Months, Unrealized Loss (913) (153)
12 Months or More, Fair Value 59,984 63,699
12 Months or More, Unrealized Loss (2,556) (1,729)
Total, Fair Value 110,001 93,843
Total, Unrealized Loss (3,469) (1,882)
Corporate Notes and Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 5,225 5,005
Less than 12 Months, Unrealized Loss (38) (9)
12 Months or More, Fair Value 9,077 9,042
12 Months or More, Unrealized Loss (421) (453)
Total, Fair Value 14,302 14,047
Total, Unrealized Loss (459) (462)
Pooled SBA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 7,513 0
Less than 12 Months, Unrealized Loss (67) 0
12 Months or More, Fair Value 21,272 22,270
12 Months or More, Unrealized Loss (1,046) (575)
Total, Fair Value 28,785 22,270
Total, Unrealized Loss (1,113) (575)
Other [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 943 962
12 Months or More, Unrealized Loss (77) (58)
Total, Fair Value 943 962
Total, Unrealized Loss $ (77) $ (58)