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Investment Securities - Securities Temporarily Impaired (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value $ 148,611 $ 276,518
Less than 12 months, Unrealized Losses (2,100) (7,383)
12 months or more, Fair Value 144,394 3,033
12 months or more, Unrealized Losses (3,843) (191)
Fair Value 293,005 279,551
Unrealized Losses (5,943) (7,574)
U.S. Government-sponsored agencies    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 7,161 6,642
Less than 12 months, Unrealized Losses (94) (233)
12 months or more, Fair Value 3,814 0
12 months or more, Unrealized Losses (86) 0
Fair Value 10,975 6,642
Unrealized Losses (180) (233)
Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 132,025 197,528
Less than 12 months, Unrealized Losses (1,857) (3,090)
12 months or more, Fair Value 101,707 2,905
12 months or more, Unrealized Losses (2,693) (184)
Fair Value 233,732 200,433
Unrealized Losses (4,550) (3,274)
State and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 9,425 72,348
Less than 12 months, Unrealized Losses (149) (4,060)
12 months or more, Fair Value 38,864 0
12 months or more, Unrealized Losses (1,061) 0
Fair Value 48,289 72,348
Unrealized Losses (1,210) (4,060)
Other equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 0 0
Less than 12 months, Unrealized Losses 0 0
12 months or more, Fair Value 9 128
12 months or more, Unrealized Losses (3) (7)
Fair Value 9 128
Unrealized Losses $ (3) $ (7)