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Investment Securities - Securities Available for Sale in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value    
Securities available for sale, less than 12 months, fair value $ 257,312 $ 310,154
Securities available for sale, 12 months or longer, fair value 367,269 87,908
Securities available for sale, fair value 624,581 398,062
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (428) (2,686)
Securities available for sale, 12 months or longer, unrealized losses (8,263) (2,252)
Securities available for sale, unrealized losses (8,691) (4,938)
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 12,916 114,120
Securities available for sale, 12 months or longer, fair value 140,506 26,726
Securities available for sale, fair value 153,422 140,846
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (62) (1,294)
Securities available for sale, 12 months or longer, unrealized losses (2,794) (765)
Securities available for sale, unrealized losses (2,856) (2,059)
Obligations of state and political subdivisions    
Fair Value    
Securities available for sale, less than 12 months, fair value 668 11,144
Securities available for sale, 12 months or longer, fair value 3,989 2,709
Securities available for sale, fair value 4,657 13,853
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses 0 (29)
Securities available for sale, 12 months or longer, unrealized losses (43) (24)
Securities available for sale, unrealized losses (43) (53)
Mortgage-backed securities    
Fair Value    
Securities available for sale, less than 12 months, fair value 43,276 177,919
Securities available for sale, 12 months or longer, fair value 195,697 31,787
Securities available for sale, fair value 238,973 209,706
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (352) (1,293)
Securities available for sale, 12 months or longer, unrealized losses (4,388) (562)
Securities available for sale, unrealized losses (4,740) (1,855)
Collateralized mortgage obligations    
Fair Value    
Securities available for sale, less than 12 months, fair value 540 5,166
Securities available for sale, 12 months or longer, fair value 27,077 26,686
Securities available for sale, fair value 27,617 31,852
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (1) (47)
Securities available for sale, 12 months or longer, unrealized losses (1,038) (901)
Securities available for sale, unrealized losses $ (1,039) (948)
Other investment securities    
Fair Value    
Securities available for sale, less than 12 months, fair value   1,805
Securities available for sale, 12 months or longer, fair value   0
Securities available for sale, fair value   1,805
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses   (23)
Securities available for sale, 12 months or longer, unrealized losses   0
Securities available for sale, unrealized losses   $ (23)