Securities - Amortized Cost and Estimated Fair Value by Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 6,872
Due after one year through five years	115,573
Due after five years through ten years	75,996
Due after ten years	25,450
Amortized Cost	337,774
Fair Value
Due in one year or less	6,868
Due after one year through five years	114,672
Due after five years through ten years	74,952
Due after ten years	24,294
Fair Value	332,653
Gross realized gains and losses [Abstract]
Gross realized gains	342
Gross realized gains		$ 825	$ 844
Gross realized losses	(261)
Gross realized losses		(13)	(8)
Proceeds from sales of securities available for sale	57,607	55,903	13,019
Proceeds from sales of securities		$ 55,903	$ 13,019
Mortgage-backed and CMOs
Amortized Cost
Mortgage-backed and CMOs	113,883
Amortized Cost	113,883
Fair Value
Mortgage-backed and CMOs	111,867
Fair Value	$ 111,867