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Investment Securities - Securities Temporarily Impaired (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value $ 276,518 $ 168,818
Less than 12 months, Unrealized Losses (7,383) (2,525)
12 months or more, Fair Value 3,033 21,048
12 months or more, Unrealized Losses (191) (950)
Fair Value 279,551 189,866
Unrealized Losses (7,574) (3,475)
U.S. Government-sponsored agencies    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 6,642 45,311
Less than 12 months, Unrealized Losses (233) (1,469)
12 months or more, Fair Value 0 17,185
12 months or more, Unrealized Losses 0 (815)
Fair Value 6,642 62,496
Unrealized Losses (233) (2,284)
Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 197,528 120,915
Less than 12 months, Unrealized Losses (3,090) (1,027)
12 months or more, Fair Value 2,905 910
12 months or more, Unrealized Losses (184) (71)
Fair Value 200,433 121,825
Unrealized Losses (3,274) (1,098)
State and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 72,348 2,528
Less than 12 months, Unrealized Losses (4,060) (24)
12 months or more, Fair Value 0 2,901
12 months or more, Unrealized Losses 0 (63)
Fair Value 72,348 5,429
Unrealized Losses (4,060) (87)
Other equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 months, Fair Value 0 64
Less than 12 months, Unrealized Losses 0 (5)
12 months or more, Fair Value 128 52
12 months or more, Unrealized Losses (7) (1)
Fair Value 128 116
Unrealized Losses $ (7) $ (6)