Loans and Allowance for Loan Losses - Average Recorded Investment and Interest Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	$ 7,808,000	$ 2,535,000	$ 4,186,000	$ 2,385,000
With no related allowance recorded, Interest Recognized For The Period Ended	7,000	0	13,000	0
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	6,792,000	5,966,000	4,900,000	6,331,000
With an allowance recorded, Interest Recognized For The Period Ended	23,000	40,000	60,000	85,000
Total average recorded investment	14,600,000	8,501,000	9,086,000	8,716,000
Total interest income recognized For the Period Ended	30,000	40,000	73,000	85,000
Commercial, financial, and agricultural
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	3,059,000	1,189,000	1,370,000	1,304,000
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	1,615,000	1,079,000	1,195,000	1,115,000
With an allowance recorded, Interest Recognized For The Period Ended	11,000	11,000	19,000	21,000
Residential real estate
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	2,758,000	1,092,000	1,355,000	785,000
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	3,724,000	3,481,000	2,990,000	4,044,000
With an allowance recorded, Interest Recognized For The Period Ended	8,000	21,000	28,000	46,000
Residential real estate | Construction
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	766,000	0	142,000	0
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	1,448,000	107,000	1,178,000	144,000
With no related allowance recorded, Interest Recognized For The Period Ended	7,000	0	13,000	0
With an allowance recorded:
With an allowance recorded, Average Recorded Investment	540,000	1,170,000	438,000	927,000
With an allowance recorded, Interest Recognized For The Period Ended	3,000	7,000	6,000	16,000
Commercial real estate | Construction
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	528,000	147,000	271,000	152,000
With no related allowance recorded, Interest Recognized For The Period Ended	0	0	0	0
Installment and other consumer
With no related allowance recorded:
With no related allowance recorded, Average Recorded Investment	15,000	0	12,000	0
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	147,000	236,000	135,000	245,000
With an allowance recorded, Interest Recognized For The Period Ended	$ 1,000	$ 1,000	$ 7,000	$ 2,000