Loans and Allowance - Summary of Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Recorded Balance	$ 692	$ 721
Post-Modification Recorded Balance	$ 690	$ 719
Number of Loans | loan	13	18
Commercial and farmland
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Recorded Balance		$ 85
Post-Modification Recorded Balance		$ 85
Number of Loans | loan		1
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Recorded Balance	$ 636	$ 490
Post-Modification Recorded Balance	$ 629	$ 487
Number of Loans | loan	11	11
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Recorded Balance	$ 56	$ 81
Post-Modification Recorded Balance	$ 61	$ 81
Number of Loans | loan	2	3
Individuals' loans for household and other personal expenditures
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Recorded Balance		$ 65
Post-Modification Recorded Balance		$ 66
Number of Loans | loan		3