Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment securities available-for-sale [Abstract]
Amortized cost	$ 340,706	$ 320,062
Unrealized gains	3,131	465
Unrealized losses	(940)	(5,890)
Estimated fair value	342,897	314,637
Gross realized gains from sales/calls of available-for-sale securities	81	0	$ 2
Gross realized losses from sales or calls of available-for-sale securities	84	20	$ 16
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	42,667	50,825
Unrealized gains	601	14
Unrealized losses	(13)	(157)
Estimated fair value	43,255	50,682
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	53,525	42,215
Unrealized gains	433	89
Unrealized losses	(46)	(228)
Estimated fair value	53,912	42,076
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	26,311	19,110
Unrealized gains	749	181
Unrealized losses	(29)	(123)
Estimated fair value	27,031	19,168
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	79,470	65,615
Unrealized gains	349	34
Unrealized losses	(399)	(1,850)
Estimated fair value	79,420	63,799
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	138,733	142,297
Unrealized gains	999	147
Unrealized losses	(453)	(3,532)
Estimated fair value	$ 139,279	$ 138,912