Loans and Allowance - Summary of Troubled Debt Restructurings by Modification (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	$ 675	$ 777
Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	95	249
Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	87	289
Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	493	239
Commercial and farmland
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		85
Commercial and farmland | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		85
Commercial and farmland | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		0
Commercial and farmland | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	614	448
Residential | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	95	0
Residential | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	87	209
Residential | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	432	239
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	61	180
Home equity | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	0	106
Home equity | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	0	74
Home equity | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification	$ 61	0
Individuals' loans for household and other personal expenditures
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		64
Individuals' loans for household and other personal expenditures | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		58
Individuals' loans for household and other personal expenditures | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		6
Individuals' loans for household and other personal expenditures | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Modification		$ 0