Securities Available-for-Sale (Details) - Investments classified by maturity date - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities Available-for-Sale:
Due in one year or less, amortized cost	$ 5,947
Due in one year or less, fair value	5,982
Due after one year through five years, amortized cost	23,657
Due after one year through five years, fair value	23,651
Due after five years through ten years, amortized cost	21,837
Due after five years through ten years, fair value	22,345
Due after ten years, amortized cost	147,868
Due after ten years, fair value	152,385
Total, amortized cost	443,859	$ 401,048
Total, fair value	453,015	404,701
Residential mortgage pass-through securities [Member]
Securities Available-for-Sale:
Total, amortized cost	238,193	199,611
Total, fair value	242,224	200,496
Commercial mortgage pass-through securities [Member]
Securities Available-for-Sale:
Total, amortized cost	6,176	4,995
Total, fair value	6,247	4,997
Other securities [Member]
Securities Available-for-Sale:
Total, amortized cost	181	140
Total, fair value	$ 181	$ 140