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Investment Securities Available for Sale Securities in Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
securities
Dec. 31, 2017
USD ($)
securities
Available-for-sale securities, Fair value    
Available-for-sale securities, Less than 12 months $ 27,863 $ 378,406
Available-for-sale securities, 12 months or longer 800,914 495,297
Available-for-sale securities, Total 828,777 873,703
Available-for-sale securities, Unrealized losses    
Available-for-sale securities, Less than 12 months (139) (2,463)
Available-for-sale securities, 12 months or longer (27,007) (14,708)
Available-for-sale securities, Total $ (27,146) $ (17,171)
Available-for-sale securities, Number of securities | securities 232 208
Held-to-maturity securities, Fair value    
Held-to-maturity securities, Less than 12 months $ 0 $ 59,218
Held-to-maturity securities, 12 months or longer 58,695 14,563
Held-to-maturity securities, Total 58,695 73,781
Held-to-maturity securities, Unrealized losses    
Held-to-maturity securities, Less than 12 months 0 (534)
Held-to-maturity securities, 12 months or longer (1,845) (261)
Held-to-maturity securities, Total $ (1,845) $ (795)
Held-to-maturity securities, Number of securities | securities 16 16
U.S. government and agencies    
Available-for-sale securities, Fair value    
Available-for-sale securities, Less than 12 months $ 0 $ 14,902
Available-for-sale securities, 12 months or longer 29,114 19,397
Available-for-sale securities, Total 29,114 34,299
Available-for-sale securities, Unrealized losses    
Available-for-sale securities, Less than 12 months 0 (79)
Available-for-sale securities, 12 months or longer (929) (754)
Available-for-sale securities, Total $ (929) $ (833)
Available-for-sale securities, Number of securities | securities 5 6
Government-sponsored entities    
Available-for-sale securities, Fair value    
Available-for-sale securities, Less than 12 months $ 0 $ 220,275
Available-for-sale securities, 12 months or longer 207,703 38,273
Available-for-sale securities, Total 207,703 258,548
Available-for-sale securities, Unrealized losses    
Available-for-sale securities, Less than 12 months 0 (1,350)
Available-for-sale securities, 12 months or longer (3,952) (1,272)
Available-for-sale securities, Total $ (3,952) $ (2,622)
Available-for-sale securities, Number of securities | securities 32 36
Municipal bonds    
Available-for-sale securities, Fair value    
Available-for-sale securities, Less than 12 months $ 25,394 $ 46,112
Available-for-sale securities, 12 months or longer 130,209 50,842
Available-for-sale securities, Total 155,603 96,954
Available-for-sale securities, Unrealized losses    
Available-for-sale securities, Less than 12 months (128) (131)
Available-for-sale securities, 12 months or longer (2,973) (1,017)
Available-for-sale securities, Total $ (3,101) $ (1,148)
Available-for-sale securities, Number of securities | securities 85 63
Mortgage-backed securities    
Available-for-sale securities, Fair value    
Available-for-sale securities, Less than 12 months $ 2,469 $ 97,117
Available-for-sale securities, 12 months or longer 433,888 386,785
Available-for-sale securities, Total 436,357 483,902
Available-for-sale securities, Unrealized losses    
Available-for-sale securities, Less than 12 months (11) (903)
Available-for-sale securities, 12 months or longer (19,153) (11,665)
Available-for-sale securities, Total $ (19,164) $ (12,568)
Available-for-sale securities, Number of securities | securities 110 103
Held-to-maturity securities, Fair value    
Held-to-maturity securities, Less than 12 months $ 0 $ 59,218
Held-to-maturity securities, 12 months or longer 58,695 14,563
Held-to-maturity securities, Total 58,695 73,781
Held-to-maturity securities, Unrealized losses    
Held-to-maturity securities, Less than 12 months 0 (534)
Held-to-maturity securities, 12 months or longer (1,845) (261)
Held-to-maturity securities, Total $ (1,845) $ (795)
Held-to-maturity securities, Number of securities | securities 16 16