Investment Securities, Analysis of Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2019 USD ($) Security	Dec. 31, 2018 USD ($)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 61,678	$ 74,186
Less than 12 months, unrealized losses	(238)	(237)
12 months or more, fair value	69,578	187,203
12 Months or more, unrealized losses	(702)	(5,653)
Total fair value	131,256	261,389
Total unrealized losses	$ (940)	(5,890)
Investment securities in unrealized loss position less than 12 months | Security	47
Investment securities in unrealized loss position more than 12 months | Security	82
Investment securities pledged as collateral	$ 37,943	36,781
U.S. Treasury Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	10,113	37,805
Less than 12 months, unrealized losses	(8)	(67)
12 months or more, fair value	2,015	5,951
12 Months or more, unrealized losses	(5)	(90)
Total fair value	12,128	43,756
Total unrealized losses	(13)	(157)
Securities of U.S. Government Agencies and Corporations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	13,187	16,959
Less than 12 months, unrealized losses	(44)	(39)
12 months or more, fair value	1,998	13,540
12 Months or more, unrealized losses	(2)	(189)
Total fair value	15,185	30,499
Total unrealized losses	(46)	(228)
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	4,645	847
Less than 12 months, unrealized losses	(29)	(2)
12 months or more, fair value	0	9,134
12 Months or more, unrealized losses	0	(121)
Total fair value	4,645	9,981
Total unrealized losses	(29)	(123)
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	21,763	2,217
Less than 12 months, unrealized losses	(129)	(6)
12 months or more, fair value	21,132	53,217
12 Months or more, unrealized losses	(270)	(1,844)
Total fair value	42,895	55,434
Total unrealized losses	(399)	(1,850)
Mortgage-backed Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	11,970	16,358
Less than 12 months, unrealized losses	(28)	(123)
12 months or more, fair value	44,433	105,361
12 Months or more, unrealized losses	(425)	(3,409)
Total fair value	56,403	121,719
Total unrealized losses	$ (453)	$ (3,532)