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Investment Securities - Securities Available for Sale in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value    
Securities available for sale, less than 12 months, fair value $ 240,854 $ 310,154
Securities available for sale, 12 months or longer, fair value 265,367 87,908
Securities available for sale, fair value 506,221 398,062
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (4,779) (2,686)
Securities available for sale, 12 months or longer, unrealized losses (10,759) (2,252)
Securities available for sale, unrealized losses (15,538) (4,938)
Obligations of the U.S. government and agencies    
Fair Value    
Securities available for sale, less than 12 months, fair value 82,187 114,120
Securities available for sale, 12 months or longer, fair value 107,601 26,726
Securities available for sale, fair value 189,788 140,846
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (1,634) (1,294)
Securities available for sale, 12 months or longer, unrealized losses (4,264) (765)
Securities available for sale, unrealized losses (5,898) (2,059)
Obligations of state and political subdivisions    
Fair Value    
Securities available for sale, less than 12 months, fair value 11,009 11,144
Securities available for sale, 12 months or longer, fair value 2,303 2,709
Securities available for sale, fair value 13,312 13,853
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (21) (29)
Securities available for sale, 12 months or longer, unrealized losses (71) (24)
Securities available for sale, unrealized losses (92) (53)
Mortgage-backed securities    
Fair Value    
Securities available for sale, less than 12 months, fair value 136,170 177,919
Securities available for sale, 12 months or longer, fair value 130,269 31,787
Securities available for sale, fair value 266,439 209,706
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (3,037) (1,293)
Securities available for sale, 12 months or longer, unrealized losses (4,891) (562)
Securities available for sale, unrealized losses (7,928) (1,855)
Collateralized mortgage obligations    
Fair Value    
Securities available for sale, less than 12 months, fair value 10,939 5,166
Securities available for sale, 12 months or longer, fair value 24,945 26,686
Securities available for sale, fair value 35,884 31,852
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (86) (47)
Securities available for sale, 12 months or longer, unrealized losses (1,532) (901)
Securities available for sale, unrealized losses (1,618) (948)
Other investment securities    
Fair Value    
Securities available for sale, less than 12 months, fair value 549 1,805
Securities available for sale, 12 months or longer, fair value 249 0
Securities available for sale, fair value 798 1,805
Unrealized Losses    
Securities available for sale, less than 12 months, unrealized losses (1) (23)
Securities available for sale, 12 months or longer, unrealized losses (1) 0
Securities available for sale, unrealized losses $ (2) $ (23)