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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value $ 89,833 $ 47,800
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,963) (288)
Twelve Months or Longer, Fair Value 15,809 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (537) 0
Total, Fair Value 105,642 47,800
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (2,500) (288)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 83,319 74,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,246) (1,356)
Twelve Months or Longer, Fair Value 221,541 233,434
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (14,418) (6,714)
Total, Fair Value 304,860 307,785
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (16,664) (8,070)
U.S. Government Corporations and Agencies [Member]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value 0 6,919
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (77)
Twelve Months or Longer, Fair Value 6,782 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (214) 0
Total, Fair Value 6,782 6,919
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (214) (77)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 0 5,213
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (38)
Twelve Months or Longer, Fair Value 15,316 11,749
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (140) (90)
Total, Fair Value 15,316 16,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (140) (128)
State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 33,509 18,457
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (777) (91)
Twelve Months or Longer, Fair Value 7,476 6,332
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (84) (32)
Total, Fair Value 40,985 24,789
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (861) (123)
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value 89,833 40,881
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,963) (211)
Twelve Months or Longer, Fair Value 9,027 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (323) 0
Total, Fair Value 98,860 40,881
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (2,286) (211)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 27,331 32,217
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (972) (210)
Twelve Months or Longer, Fair Value 127,441 141,371
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (6,378) (3,051)
Total, Fair Value 154,772 173,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (7,350) (3,261)
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,317 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (30) 0
Twelve Months or Longer, Fair Value 1,664 2,021
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (108) (82)
Total, Fair Value 2,981 2,021
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (138) (82)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 21,162 18,464
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (467) (1,016)
Twelve Months or Longer, Fair Value 69,644 71,957
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,708) (3,459)
Total, Fair Value 90,806 90,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (8,175) (4,475)
Equity Securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (1)
Twelve Months or Longer, Fair Value   4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Total, Fair Value   4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (1)