Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment securities available-for-sale [Abstract]
Amortized cost	$ 320,062	$ 284,947
Unrealized gains	465	311
Unrealized losses	(5,890)	(4,517)
Estimated fair value	314,637	280,741
Gross realized gains from sales/calls of available-for-sale securities	0	2	$ 24
Gross realized losses from sales or calls of available-for-sale securities	20	16	$ 25
U.S. Treasury Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	50,825	18,589
Unrealized gains	14	0
Unrealized losses	(157)	(125)
Estimated fair value	50,682	18,464
Securities of U.S. Government Agencies and Corporations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	42,215	21,353
Unrealized gains	89	0
Unrealized losses	(228)	(244)
Estimated fair value	42,076	21,109
Obligations of States and Political Subdivisions [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	19,110	23,138
Unrealized gains	181	216
Unrealized losses	(123)	(146)
Estimated fair value	19,168	23,208
Collateralized Mortgage Obligations [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	65,615	67,724
Unrealized gains	34	0
Unrealized losses	(1,850)	(1,641)
Estimated fair value	63,799	66,083
Mortgage-backed Securities [Member]
Investment securities available-for-sale [Abstract]
Amortized cost	142,297	154,143
Unrealized gains	147	95
Unrealized losses	(3,532)	(2,361)
Estimated fair value	$ 138,912	$ 151,877