Securities - Carrying Value (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost
One to five years	$ 966
Five to ten years	38,782
After ten years	194,870
Amortized Cost	234,618
Amortized cost	483,370	$ 471,070
Held-to-maturity securities, Five to ten years	12,448
Held-to-maturity securities, After ten years	6,770
Held-to-maturity securities, Amortized Cost	19,218
Fair Value
One to five years	936
Five to ten years	38,038
After ten years	188,723
Fair Value	227,697
Fair Value	470,065	456,700
Held-to-maturity securities, Five to ten years	12,347
Held-to-maturity securities, After ten years	6,457
Held-to-maturity securities, Fair Value	18,804
Mortgage-backed securities
Amortized Cost
Amortized cost	235,879	238,354
Fair Value
Fair Value	229,436	231,641
Asset-backed securities
Amortized Cost
Amortized cost	9,873	19,470
Fair Value
Fair Value	10,000	19,534
Other securities
Amortized Cost
Amortized cost	3,000	3,000
Fair Value
Fair Value	$ 2,932	$ 2,932