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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value $ 8,054 $ 48,192
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) (472)
Twelve Months or Longer, Fair Value 47,304 41,393
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (383) (874)
Total, Fair Value 55,358 89,585
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (385) (1,346)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 2,534 34,595
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10) (418)
Twelve Months or Longer, Fair Value 244,081 249,870
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (9,706) (14,180)
Total, Fair Value 246,615 284,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (9,716) (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 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Twelve Months or Longer, Fair Value 6,951 6,892
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (46) (104)
Total, Fair Value 6,951 6,892
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (46) (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 10,323 15,315
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (46) (96)
Total, Fair Value 10,323 15,315
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (46) (96)
State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,045 9,311
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (61)
Twelve Months or Longer, Fair Value 1,018 15,302
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1) (164)
Total, Fair Value 2,063 24,613
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (1) (225)
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value 8,054 48,192
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) (472)
Twelve Months or Longer, Fair Value 40,353 34,501
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (337) (770)
Total, Fair Value 48,407 82,693
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (339) (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 141,650 141,924
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,449) (4,743)
Total, Fair Value 141,650 149,023
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (2,449) (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 2,786 1,599
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (63) (78)
Total, Fair Value 2,786 2,888
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (63) (94)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,489 16,896
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10) (235)
Twelve Months or Longer, Fair Value 88,304 75,730
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,147) (9,099)
Total, Fair Value 89,793 92,626
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (7,157) $ (9,334)