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Investment Securities - Securities Available for Sale in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value    
Securities available for sale, less than 12 months, fair value $ 21,515 $ 256,644
Securities available for sale, 12 months or longer, fair value 101,364 367,269
Securities available for sale, fair value 122,879 623,913
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (61) (428)
Securities available for sale, 12 months or longer, unrealized losses (477) (8,263)
Securities available for sale, unrealized losses (538) (8,691)
U.S. Treasury securities    
Fair Value    
Securities available for sale, less than 12 months, fair value   199,912
Securities available for sale, 12 months or longer, fair value   0
Securities available for sale, fair value   199,912
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses   (13)
Securities available for sale, 12 months or longer, unrealized losses   0
Securities available for sale, unrealized losses   (13)
Obligations of the U.S. government and agencies    
Fair Value    
Securities available for sale, less than 12 months, fair value 12,987 12,916
Securities available for sale, 12 months or longer, fair value 30,301 140,506
Securities available for sale, fair value 43,288 153,422
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (12) (62)
Securities available for sale, 12 months or longer, unrealized losses (87) (2,794)
Securities available for sale, unrealized losses (99) (2,856)
Obligations of state and political subdivisions    
Fair Value    
Securities available for sale, less than 12 months, fair value 0 0
Securities available for sale, 12 months or longer, fair value 959 3,989
Securities available for sale, fair value 959 3,989
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses 0 0
Securities available for sale, 12 months or longer, unrealized losses (2) (43)
Securities available for sale, unrealized losses (2) (43)
Mortgage-backed securities    
Fair Value    
Securities available for sale, less than 12 months, fair value 8,528 43,276
Securities available for sale, 12 months or longer, fair value 49,072 195,697
Securities available for sale, fair value 57,600 238,973
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (49) (352)
Securities available for sale, 12 months or longer, unrealized losses (184) (4,388)
Securities available for sale, unrealized losses (233) (4,740)
Collateralized mortgage obligations    
Fair Value    
Securities available for sale, less than 12 months, fair value 0 540
Securities available for sale, 12 months or longer, fair value 21,032 27,077
Securities available for sale, fair value 21,032 27,617
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses 0 (1)
Securities available for sale, 12 months or longer, unrealized losses (204) (1,038)
Securities available for sale, unrealized losses $ (204) $ (1,039)