XML 56 R45.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value $ 94,642 $ 47,800
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,815) (288)
Twelve Months or Longer, Fair Value 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Total, Fair Value 94,642 47,800
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (1,815) (288)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 93,482 74,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,065) (1,356)
Twelve Months or Longer, Fair Value 215,228 233,434
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (13,632) (6,714)
Total, Fair Value 308,710 307,785
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (15,697) (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 6,813 6,919
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (183) (77)
Twelve Months or Longer, Fair Value 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Total, Fair Value 6,813 6,919
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (183) (77)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 5,121 5,213
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (58) (38)
Twelve Months or Longer, Fair Value 10,218 11,749
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (105) (90)
Total, Fair Value 15,339 16,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (163) (128)
State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 29,012 18,457
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (521) (91)
Twelve Months or Longer, Fair Value 7,449 6,332
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (54) (32)
Total, Fair Value 36,461 24,789
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (575) (123)
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than Twelve Months, Fair Value 87,829 40,881
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,632) (211)
Twelve Months or Longer, Fair Value 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Total, Fair Value 87,829 40,881
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss (1,632) (211)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 35,367 32,217
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (931) (210)
Twelve Months or Longer, Fair Value 128,118 141,371
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (5,653) (3,051)
Total, Fair Value 163,485 173,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (6,584) (3,261)
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,393 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (21) 0
Twelve Months or Longer, Fair Value 1,778 2,021
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (105) (82)
Total, Fair Value 3,171 2,021
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (126) (82)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 22,589 18,464
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (534) (1,016)
Twelve Months or Longer, Fair Value 67,665 71,957
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,715) (3,459)
Total, Fair Value 90,254 90,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (8,249) (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)