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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value $ 15,022 $ 48,192
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (39) (472)
Twelve Months or Longer, Fair Value 3,652 41,393
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (21) (874)
Total, Fair Value 18,674 89,585
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (60) (1,346)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,497 34,595
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (4) (418)
Twelve Months or Longer, Fair Value 182,692 249,870
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,225) (14,180)
Total, Fair Value 184,189 284,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (7,229) (14,598)
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
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
Twelve Months or Longer, Fair Value   6,892
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (104)
Total, Fair Value   6,892
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss   (104)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Twelve Months or Longer, Fair Value 10,316 15,315
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (16) (96)
Total, Fair Value 10,316 15,315
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (16) (96)
State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value   9,311
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (61)
Twelve Months or Longer, Fair Value   15,302
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (164)
Total, Fair Value   24,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   (225)
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value 15,022 48,192
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (39) (472)
Twelve Months or Longer, Fair Value 3,652 34,501
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (21) (770)
Total, Fair Value 18,674 82,693
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (60) (1,242)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 0 7,099
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (106)
Twelve Months or Longer, Fair Value 99,801 141,924
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (972) (4,743)
Total, Fair Value 99,801 149,023
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (972) (4,849)
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 0 1,289
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (16)
Twelve Months or Longer, Fair Value 1,466 1,599
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (31) (78)
Total, Fair Value 1,466 2,888
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (31) (94)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,497 16,896
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (4) (235)
Twelve Months or Longer, Fair Value 71,109 75,730
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (6,206) (9,099)
Total, Fair Value 72,606 92,626
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (6,210) $ (9,334)