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Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 47,630
Due after one year through five years	122,824
Due after five years through ten years	63,472
Due after ten years	17,805
Debt Securities Available-for-sale, Maturity, Amortized Cost	251,731
Debt Securities, Available-for-Sale, Amortized Cost	652,785	$ 685,170
Fair Value
Due in one year or less	47,770
Due after one year through five years	124,741
Due after five years through ten years	66,144
Due after ten years	18,750
Debt Securities Available-for-sale, Maturity, Fair Value	257,405
Debt Securities, Available-for-Sale, Fair Value	664,037	680,056
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Debt Securities Available-for-Sale With Maturities	232,657
Debt Securities, Available-for-Sale, Amortized Cost	232,657	251,660
Fair Value
Debt Securities Available-for-Sale With Maturities	235,291
Debt Securities, Available-for-Sale, Fair Value	235,292	246,784
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Debt Securities Available-for-Sale With Maturities	20,705
Debt Securities, Available-for-Sale, Amortized Cost	20,704	24,564
Fair Value
Debt Securities Available-for-Sale With Maturities	20,936
Debt Securities, Available-for-Sale, Fair Value	20,936	24,350
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Debt Securities Available-for-Sale With Maturities	147,692
Debt Securities, Available-for-Sale, Amortized Cost	147,692	149,849
Fair Value
Debt Securities Available-for-Sale With Maturities	150,405
Debt Securities, Available-for-Sale, Fair Value	$ 150,405	$ 148,659

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