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Investment Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value    
Less than 12 Months $ 145,676 $ 202,036
Total 253,127 634,440
Less than 12 Months (558) (823)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 107,451 432,404
12 Months or Longer (950) (11,908)
Total (1,508) (12,731)
U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value    
Less than 12 Months 45,999 46,992
Total 45,999 54,342
Less than 12 Months (84) (58)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 7,350
12 Months or Longer 0 (89)
Total (84) (147)
Municipal securities    
Fair Value    
Less than 12 Months 13,761 31,157
Total 13,761 69,949
Less than 12 Months (102) (159)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 38,792
12 Months or Longer 0 (647)
Total (102) (806)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 14,272 66,620
Total 74,504 260,346
Less than 12 Months (66) (247)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 60,232 193,726
12 Months or Longer (439) (5,872)
Total (505) (6,119)
Commercial mortgage-backed securities    
Fair Value    
Less than 12 Months 56,263 43,531
Total 99,886 234,116
Less than 12 Months (177) (272)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 43,623 190,585
12 Months or Longer (472) (5,252)
Total (649) (5,524)
Corporate obligations    
Fair Value    
Less than 12 Months 998 13,736
Total 2,985 15,687
Less than 12 Months (2) (87)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,987 1,951
12 Months or Longer (13) (48)
Total (15) $ (135)
Other Security Investments    
Fair Value    
Less than 12 Months 14,383  
Total 15,992  
Less than 12 Months (127)  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,609  
12 Months or Longer (26)  
Total $ (153)