Loans - Loans Acquired (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans
Outstanding principal balance	$ 122,301	$ 34,101
Carrying amount
Total acquired loans	109,290	27,127
Real estate - residential mortgage
Carrying amount
Total acquired loans	21,352	7,142
Real estate - construction
Carrying amount
Total acquired loans	3,153
Commercial, financial and agricultural
Carrying amount
Total acquired loans	71,782	11,901
Equity lines
Carrying amount
Total acquired loans	10,468	8,081
Consumer
Carrying amount
Total acquired loans	2,535	3
PCI Loans
Loans
Outstanding principal balance	18,319	6,262
Carrying amount
Total acquired loans	7,574	705
PCI Loans | Real estate - residential mortgage
Carrying amount
Total acquired loans	1,724	107
PCI Loans | Commercial, financial and agricultural
Carrying amount
Total acquired loans	5,398	563
PCI Loans | Equity lines
Carrying amount
Total acquired loans	81	35
PCI Loans | Consumer
Carrying amount
Total acquired loans	371
Purchased Performing Loans
Loans
Outstanding principal balance	103,982	27,839
Carrying amount
Total acquired loans	101,716	26,422
Purchased Performing Loans | Real estate - residential mortgage
Carrying amount
Total acquired loans	19,628	7,035
Purchased Performing Loans | Real estate - construction
Carrying amount
Total acquired loans	3,153
Purchased Performing Loans | Commercial, financial and agricultural
Carrying amount
Total acquired loans	66,384	11,338
Purchased Performing Loans | Equity lines
Carrying amount
Total acquired loans	10,387	8,046
Purchased Performing Loans | Consumer
Carrying amount
Total acquired loans	$ 2,164	$ 3