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Loans and Allowance - Allowance by Loan Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | $ 1,476 | $ 2,066 | $ 2,066
Impact of ASC 326 adoption | 1,574 |  |
Charged off | (81) | (125) | (392)
Recoveries | 356 |  | 491
Provision for loan losses | (404) | (80) | 689
Balance, end of year | 2,921 |  | 1,476
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 11 |  | 11
Individually evaluated for impairment, Related loan balance | 38 |  | 4,664
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 2,910 |  | 1,465
Collectively evaluated for impairment, Related loan balance | 246,815 |  | 249,108
Real Estate Loan |  |  |
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 11 |  | 11
Construction And Land Development | Real Estate Loan |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 9 | 24 | 24
Impact of ASC 326 adoption | 16 |  |
Provision for loan losses | 7 |  | 15
Balance, end of year | 32 |  | 9
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 32 |  | 9
Collectively evaluated for impairment, Related loan balance | 3,174 |  | 2,553
Farmland | Real Estate Loan |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 2 | 2 | 2
Impact of ASC 326 adoption | 9 |  |
Provision for loan losses | (1) |  |
Balance, end of year | 10 |  | 2
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 10 |  | 2
Collectively evaluated for impairment, Related loan balance | 349 |  | 350
Single-family residential | Real Estate Loan |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 513 | 849 | 849
Impact of ASC 326 adoption | 854 |  |
Recoveries | 275 |  | 266
Provision for loan losses | (272) |  | 602
Balance, end of year | 1,370 |  | 513
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance | 11 |  | 11
Individually evaluated for impairment, Related loan balance | 38 |  | 132
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 1,359 |  | 513
Collectively evaluated for impairment, Related loan balance | 82,782 |  | 82,388
Multifamily | Real Estate Loan |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 39 | 40 | 40
Impact of ASC 326 adoption | 63 |  |
Provision for loan losses |  |  | 1
Balance, end of year | 102 |  | 39
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 102 |  | 39
Collectively evaluated for impairment, Related loan balance | 6,069 |  | 6,105
Commercial And Industrial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 67 | 69 | 69
Impact of ASC 326 adoption | 120 |  |
Recoveries |  |  | 20
Provision for loan losses | (19) |  | 22
Balance, end of year | 168 |  | 67
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Related loan balance |  |  | 4,493
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 168 |  | 67
Collectively evaluated for impairment, Related loan balance | 9,521 |  | 6,307
Commercial | Real Estate Loan |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 218 | 241 | 241
Impact of ASC 326 adoption | 199 |  |
Provision for loan losses | (8) |  | 23
Balance, end of year | 409 |  | 218
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 409 |  | 218
Collectively evaluated for impairment, Related loan balance | 55,723 |  | 57,027
SBA Guaranty | Commercial and Industrial Sector [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 48 | 25 | 25
Impact of ASC 326 adoption | (6) |  |
Provision for loan losses | (1) |  | (23)
Balance, end of year | 41 |  | 48
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 41 |  | 48
Collectively evaluated for impairment, Related loan balance | 7,192 |  | 7,200
Comm SBA PPP | Commercial and Industrial Sector [Member] |  |  |
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Related loan balance | 11,244 |  | 9,912
Consumer | Consumer Loan [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 11 | 11 | 11
Impact of ASC 326 adoption | 46 |  |
Recoveries |  |  | 6
Provision for loan losses | (11) |  | 6
Balance, end of year | 46 |  | 11
Individually evaluated for impairment: |  |  |
Individually evaluated for impairment, Balance in allowance |  |  | 11
Individually evaluated for impairment, Related loan balance |  |  | 39
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 46 |  |
Collectively evaluated for impairment, Related loan balance | 2,482 |  | 3,024
Automobile | Consumer Loan [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Balance, beginning of year | 569 | $ 805 | 805
Impact of ASC 326 adoption | 273 |  |
Charged off | (81) |  | (392)
Recoveries | 81 |  | 199
Provision for loan losses | (99) |  | 43
Balance, end of year | 743 |  | 569
Collectively evaluated for impairment: |  |  |
Collectively evaluated for impairment, Balance in allowance | 743 |  | 569
Collectively evaluated for impairment, Related loan balance | $ 68,279 |  | $ 74,242

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