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Loans and Allowance - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 2,541 |  |  |  |  | $ 2,541 | $ 2,589
Charged off |  |  |  |  |  |  |  |  | (616) | (1,151)
Recoveries |  |  |  |  |  |  |  |  | 256 | 247
Provision for loan losses | $ (179) | $ (139) | $ 30 | 173 | $ 255 | $ 246 | $ (5) | $ 360 | (115) | 856
Balance, end of year | 2,066 |  |  |  | 2,589 |  |  |  | 2,066 | 2,541
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 15 |  |  |  |  |  |  |  | 15 | 226
Individually evaluated for impairment, Related loan balance | 4,397 |  |  |  |  |  |  |  | 4,397 | 2,250
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 2,051 |  |  |  |  |  |  |  | 2,051 | 2,315
Collectively evaluated for impairment, Related loan balance | 280,341 |  |  |  |  |  |  |  | 280,341 | 296,870
Consumer |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 161 |  |  |  |  | 161 | 214
Charged off |  |  |  |  |  |  |  |  | (69) | (208)
Recoveries |  |  |  |  |  |  |  |  | 16 | 48
Provision for loan losses |  |  |  |  |  |  |  |  | 14 | 107
Balance, end of year | 122 |  |  |  | 214 |  |  |  | 122 | 161
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 15 |  |  |  |  |  |  |  | 15 | 22
Individually evaluated for impairment, Related loan balance | 86 |  |  |  |  |  |  |  | 86 | 138
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 107 |  |  |  |  |  |  |  | 107 | 139
Collectively evaluated for impairment, Related loan balance | 11,990 |  |  |  |  |  |  |  | 11,990 | 12,933
Residential Real estate |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 864 |  |  |  |  | 864 | 1,061
Charged off |  |  |  |  |  |  |  |  | (16) | (589)
Recoveries |  |  |  |  |  |  |  |  | 5 | 2
Provision for loan losses |  |  |  |  |  |  |  |  | (264) | 390
Balance, end of year | 589 |  |  |  | 1,061 |  |  |  | 589 | 864
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Related loan balance | 631 |  |  |  |  |  |  |  | 631 | 854
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 589 |  |  |  |  |  |  |  | 589 | 864
Collectively evaluated for impairment, Related loan balance | 80,402 |  |  |  |  |  |  |  | 80,402 | 81,783
Indirect |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 988 |  |  |  |  | 988 | 774
Charged off |  |  |  |  |  |  |  |  | (504) | (341)
Recoveries |  |  |  |  |  |  |  |  | 225 | 183
Provision for loan losses |  |  |  |  |  |  |  |  | 208 | 372
Balance, end of year | 917 |  |  |  | 774 |  |  |  | 917 | 988
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 917 |  |  |  |  |  |  |  | 917 | 988
Collectively evaluated for impairment, Related loan balance | 102,384 |  |  |  |  |  |  |  | 102,384 | 116,698
Commercial |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 241 |  |  |  |  | 241 | 237
Charged off |  |  |  |  |  |  |  |  | (27) |
Recoveries |  |  |  |  |  |  |  |  | 10 | 14
Provision for loan losses |  |  |  |  |  |  |  |  | (186) | (10)
Balance, end of year | 38 |  |  |  | 237 |  |  |  | 38 | 241
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance |  |  |  |  |  |  |  |  |  | 204
Individually evaluated for impairment, Related loan balance |  |  |  |  |  |  |  |  |  | 204
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 38 |  |  |  |  |  |  |  | 38 | 37
Collectively evaluated for impairment, Related loan balance | 11,907 |  |  |  |  |  |  |  | 11,907 | 14,080
Construction |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 4 |  |  |  |  | 4 | 12
Provision for loan losses |  |  |  |  |  |  |  |  | 7 | (8)
Balance, end of year | 11 |  |  |  | 12 |  |  |  | 11 | 4
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 11 |  |  |  |  |  |  |  | 11 | 4
Collectively evaluated for impairment, Related loan balance | 3,317 |  |  |  |  |  |  |  | 3,317 | 2,317
Commercial Real Estate |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 283 |  |  |  |  | 283 | 291
Charged off |  |  |  |  |  |  |  |  |  | (13)
Provision for loan losses |  |  |  |  |  |  |  |  | 106 | 5
Balance, end of year | 389 |  |  |  | $ 291 |  |  |  | 389 | 283
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Related loan balance | 3,680 |  |  |  |  |  |  |  | 3,680 | 1,054
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 389 |  |  |  |  |  |  |  | 389 | 283
Collectively evaluated for impairment, Related loan balance | $ 70,341 |  |  |  |  |  |  |  | $ 70,341 | 69,059
Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance |  |  |  |  |  |  |  |  |  | $ 204

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