Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investment Securities
Available-for-sale, Due in one year or less, Amortized Cost	$ 5,091
Available-for-sale, Due after one year through five years, Amortized Cost	17,766
Available-for-sale, Due after five years through ten years, Amortized Cost	32,514
Available-for-sale, Due after ten years, Amortized Cost	55,376
Available-for-sale, MBS/CMO/REMIC, Amortized Cost	172,839
Available-for-sale, Amortized Cost	283,586	$ 296,681
Available-for-sale, Due in one year or less, Fair Value	5,097
Available-for-sale, Due after one year through five years, Fair Value	17,953
Available-for-sale, Due after five years through ten years, Fair Value	33,359
Available-for-sale, Due after ten years, Fair Value	58,770
Available-for-sale, MBS/CMO/REMIC, Fair Value	174,875
Available-for-sale, Fair Value	290,054	294,076
Held-to-maturity Securities, Due in one year or less, Amortized Cost	0
Held-to-maturity Securities, Due after one year through five years, Amortized Cost	0
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	444
Held-to-maturity Securities, Due after ten years, Amorized Cost	0
Held-to-maturity, MBS/CMO/REMIC, Amortized Cost	37
Held-to-maturity, Amortized Cost	481	526
Held-to-maturity Securities, Due in one year or less, Fair Value	0
Held-to-maturity Securities, Due after one year through five years, Fair Value	0
Held-to-maturity Securites, Due after five years through ten years, Fair Value	444
Held-to-maturity Securities, Due after ten years, Fair Value	0
Held-to-maturity, MBS/CMO/REMIC, Fair Value	37
Held-to-maturity, Fair Value	$ 481	$ 526