Securities - Amortized Cost and Estimated Fair Value by Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 41,234
Due after one year through five years	51,039
Due after five years through ten years	56,537
Due after ten years	43,952
Amortized Cost	375,494	$ 337,774
Fair Value
Due in one year or less	41,207
Due after one year through five years	51,814
Due after five years through ten years	57,763
Due after ten years	44,171
Fair Value	379,195	332,653
Gross realized gains and losses [Abstract]
Gross realized gains	328	342	$ 825
Gross realized losses	(54)	(261)	(13)
Proceeds from sales of securities	29,878	57,607	$ 55,903
Mortgage-backed and CMOs
Amortized Cost
Mortgage-backed and CMOs	182,732
Amortized Cost	182,732	113,883
Fair Value
Mortgage-backed and CMOs	184,240
Fair Value	$ 184,240	$ 111,867