Loans and Allowance - Non-accrual loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 4,127	$ 1,947
Transfer into non-accrual	177	1,061
Loans paid down/payoffs	(74)	(315)
Loans return to accrual status	(17)	(19)
Loans charged off	(125)	(212)
Balance	4,088	2,462
Consumer
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	137	186
Transfer into non-accrual		134
Loans paid down/payoffs	(5)	(8)
Balance	132	312
Residential Real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	728	956
Transfer into non-accrual		571
Loans paid down/payoffs	(15)	(283)
Loans charged off		(12)
Balance	713	1,232
Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	123	116
Transfer into non-accrual	177	270
Loans paid down/payoffs	(22)	(8)
Loans return to accrual status	(17)	(19)
Loans charged off	(125)	(173)
Balance	136	186
Commercial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance		27
Transfer into non-accrual		86
Loans charged off		(27)
Balance		86
Commercial Real Estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	3,139	662
Loans paid down/payoffs	(32)	(16)
Balance	$ 3,107	$ 646