Loans and Allowance - Non-accrual loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 4,127	$ 1,947
Transfer into non-accrual	2,234	4,240
Loans paid down/payoffs	(880)	(1,268)
Loans return to accrual status	(594)	(221)
Loans charged off	(375)	(571)
Balance	4,512	4,127
Consumer
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	137	186
Transfer into non-accrual	64	135
Loans paid down/payoffs	(67)	(55)
Loans return to accrual status		(88)
Loans charged off		(41)
Balance	134	137
Residential Real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	728	956
Transfer into non-accrual		571
Loans paid down/payoffs	(557)	(782)
Loans charged off		(17)
Balance	171	728
Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	123	116
Transfer into non-accrual	551	702
Loans paid down/payoffs	(104)	(76)
Loans return to accrual status	(17)	(133)
Loans charged off	(375)	(486)
Balance	178	123
Commercial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance		27
Transfer into non-accrual		86
Loans paid down/payoffs		(86)
Loans charged off		(27)
Commercial | Real Estate Loan
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	3,139	662
Transfer into non-accrual	1,619	2,746
Loans paid down/payoffs	(152)	(269)
Loans return to accrual status	(577)
Balance	$ 4,029	$ 3,139