Loans and Allowance for Loan Losses - Average Recorded Investment and Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	$ 2,682	$ 2,784	$ 2,232	$ 2,409
With no related allowance recorded, Interest Recognized For The Period Ended	0	6		32
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	5,204	7,139	5,985	7,592
With an allowance recorded, Interest Recognized For The Period Ended	40	46	125	119
Total average recorded investment	7,886	9,923	8,217	10,001
Total interest income recognized For the Period Ended	40	52	125	151
Commercial, financial, and agricultural
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	851	1,375	1,036	1,334
With no related allowance recorded, Interest Recognized For The Period Ended	0	0		1
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	1,086	1,423	1,095	1,507
With an allowance recorded, Interest Recognized For The Period Ended	9	8	30	23
Residential real estate
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	1,301	1,037	651	929
With no related allowance recorded, Interest Recognized For The Period Ended	0	3		9
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	2,818	4,076	3,881	4,211
With an allowance recorded, Interest Recognized For The Period Ended	21	25	68	71
Residential real estate | Construction
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	0	0	0	15
With an allowance recorded, Interest Recognized For The Period Ended	0	0	0	0
Commercial real estate
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	380	120	393	30
With no related allowance recorded, Interest Recognized For The Period Ended	0	3		22
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	1,112	1,443	788	1,649
With an allowance recorded, Interest Recognized For The Period Ended	9	13	25	24
Commercial real estate | Construction
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	146	161	149	82
With no related allowance recorded, Interest Recognized For The Period Ended	0	0	0	0
With an allowance recorded:
With an allowance recorded, Average Recorded Investment		0		24
With an allowance recorded, Interest Recognized For The Period Ended	0	0
Installment and other consumer
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	4	91	3	34
With no related allowance recorded, Interest Recognized For The Period Ended	0	0	0	0
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	188	197	221	186
With an allowance recorded, Interest Recognized For The Period Ended	$ 1	$ 0	$ 2	$ 1