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Investment Securities - Securities Available for Sale in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value    
Securities available for sale, less than 12 months, fair value $ 396,590 $ 310,154
Securities available for sale, 12 months or longer, fair value 90,683 87,908
Securities available for sale, fair value 487,273 398,062
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (8,693) (2,686)
Securities available for sale, 12 months or longer, unrealized losses (4,010) (2,252)
Securities available for sale, unrealized losses (12,703) (4,938)
Obligations of the U.S. government and agencies    
Fair Value    
Securities available for sale, less than 12 months, fair value 154,255 114,120
Securities available for sale, 12 months or longer, fair value 28,237 26,726
Securities available for sale, fair value 182,492 140,846
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (3,361) (1,294)
Securities available for sale, 12 months or longer, unrealized losses (1,254) (765)
Securities available for sale, unrealized losses (4,615) (2,059)
Obligations of state and political subdivisions    
Fair Value    
Securities available for sale, less than 12 months, fair value 5,907 11,144
Securities available for sale, 12 months or longer, fair value 1,563 2,709
Securities available for sale, fair value 7,470 13,853
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (16) (29)
Securities available for sale, 12 months or longer, unrealized losses (53) (24)
Securities available for sale, unrealized losses (69) (53)
Mortgage-backed securities    
Fair Value    
Securities available for sale, less than 12 months, fair value 228,831 177,919
Securities available for sale, 12 months or longer, fair value 37,068 31,787
Securities available for sale, fair value 265,899 209,706
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (5,183) (1,293)
Securities available for sale, 12 months or longer, unrealized losses (1,374) (562)
Securities available for sale, unrealized losses (6,557) (1,855)
Collateralized mortgage obligations    
Fair Value    
Securities available for sale, less than 12 months, fair value 6,800 5,166
Securities available for sale, 12 months or longer, fair value 23,815 26,686
Securities available for sale, fair value 30,615 31,852
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (130) (47)
Securities available for sale, 12 months or longer, unrealized losses (1,329) (901)
Securities available for sale, unrealized losses (1,459) (948)
Other investment securities    
Fair Value    
Securities available for sale, less than 12 months, fair value 797 1,805
Securities available for sale, 12 months or longer, fair value 0 0
Securities available for sale, fair value 797 1,805
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (3) (23)
Securities available for sale, 12 months or longer, unrealized losses 0 0
Securities available for sale, unrealized losses $ (3) $ (23)