Investment Securities, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2020 USD ($) Security	Dec. 31, 2019 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 95,948	$ 61,678
12 months or more, fair value	0	69,578
Total fair value	95,948	131,256
Less than 12 months, unrealized losses	(374)	(238)
12 Months or more, unrealized losses	0	(702)
Total unrealized losses	$ (374)	(940)
Investment securities in unrealized loss position less than 12 months | Security	8
Investment securities in unrealized loss position more than 12 months | Security	0
Investment securities pledged as collateral	$ 41,916	37,943
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	4,276	10,113
12 months or more, fair value	0	2,015
Total fair value	4,276	12,128
Less than 12 months, unrealized losses	(1)	(8)
12 Months or more, unrealized losses	0	(5)
Total unrealized losses	(1)	(13)
Securities of U.S. Government Agencies and Corporations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	58,164	13,187
12 months or more, fair value	0	1,998
Total fair value	58,164	15,185
Less than 12 months, unrealized losses	(265)	(44)
12 Months or more, unrealized losses	0	(2)
Total unrealized losses	(265)	(46)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	1,603	4,645
12 months or more, fair value	0	0
Total fair value	1,603	4,645
Less than 12 months, unrealized losses	(9)	(29)
12 Months or more, unrealized losses	0	0
Total unrealized losses	(9)	(29)
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	1,697	21,763
12 months or more, fair value	0	21,132
Total fair value	1,697	42,895
Less than 12 months, unrealized losses	(8)	(129)
12 Months or more, unrealized losses	0	(270)
Total unrealized losses	(8)	(399)
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	30,208	11,970
12 months or more, fair value	0	44,433
Total fair value	30,208	56,403
Less than 12 months, unrealized losses	(91)	(28)
12 Months or more, unrealized losses	0	(425)
Total unrealized losses	$ (91)	$ (453)