Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 47,052
Due after one year through five years	141,597
Due after five years through ten years	15,447
Due after ten years	4,829
Amortized Cost	208,925		$ 216,650
Estimated Fair Value
Due in one year or less	47,097
Due after one year through five years	141,414
Due after five years through ten years	15,513
Due after ten years	4,983
Fair Value	209,007		$ 214,910	[1]
Gross realized gains and losses on and the proceeds from the maturities, calls and paydowns of securities
Gross realized gains from maturities and calls of securities available for sale	4	$ 5
Net realized losses from maturities and calls of securities available for sale	4	5
Proceeds from maturities and calls and paydowns of securities	$ 15,657	$ 12,735

[1] Derived from audited consolidated financial statements.