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Loans and Allowance for Loan Losses - Schedule of Activity in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 15,352,000 |  |  |  | $ 10,050,000 | $ 15,352,000 | $ 10,050,000 | $ 9,636,000
Provision for (reversal of) loan losses |  |  |  |  |  |  |  |  | 959,000 | 5,318,000 | 1,102,000
Charge-offs |  |  |  |  |  |  |  |  | (195,000) | (45,000) | (689,000)
Recoveries |  |  |  |  |  |  |  |  | 7,000 | 29,000 | 1,000
Ending balance | $ 16,123,000 |  |  |  | $ 15,352,000 |  |  |  | 16,123,000 | 15,352,000 | 10,050,000
Provision for loan losses | 1,898,000 | $ (884,000) | $ (1,112,000) | 620,000 | 1,831,000 | $ 1,399,000 | $ 1,988,000 | 743,000 | 522,000 | 5,961,000 | 1,102,000
Uncollectible Accrued Interest Receivable |  |  |  |  |  |  |  |  |  |  |
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 205,000 | 643,000 | 0
Commercial real estate |  |  |  |  |  |  |  |  |  |  |
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 8,505,000 |  |  |  | 6,000,000 | 8,505,000 | 6,000,000 | 4,805,000
Provision for (reversal of) loan losses |  |  |  |  |  |  |  |  | (355,000) | 2,505,000 | 1,195,000
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ending balance | 8,150,000 |  |  |  | 8,505,000 |  |  |  | 8,150,000 | 8,505,000 | 6,000,000
SBA loans—real estate |  |  |  |  |  |  |  |  |  |  |
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,802,000 |  |  |  | 939,000 | 1,802,000 | 939,000 | 894,000
Provision for (reversal of) loan losses |  |  |  |  |  |  |  |  | 279,000 | 863,000 | 734,000
Charge-offs |  |  |  |  |  |  |  |  | (59,000) | 0 | (689,000)
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ending balance | 2,022,000 |  |  |  | 1,802,000 |  |  |  | 2,022,000 | 1,802,000 | 939,000
SBA loans—non-real estate |  |  |  |  |  |  |  |  |  |  |
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 278,000 |  |  |  | 121,000 | 278,000 | 121,000 | 505,000
Provision for (reversal of) loan losses |  |  |  |  |  |  |  |  | 54,000 | 174,000 | (384,000)
Charge-offs |  |  |  |  |  |  |  |  | (136,000) | (45,000) | 0
Recoveries |  |  |  |  |  |  |  |  | 3,000 | 28,000 | 0
Ending balance | 199,000 |  |  |  | 278,000 |  |  |  | 199,000 | 278,000 | 121,000
Commercial and industrial ("C&I") |  |  |  |  |  |  |  |  |  |  |
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,563,000 |  |  |  | 1,289,000 | 2,563,000 | 1,289,000 | 1,746,000
Provision for (reversal of) loan losses |  |  |  |  |  |  |  |  | 285,000 | 1,274,000 | (457,000)
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ending balance | 2,848,000 |  |  |  | 2,563,000 |  |  |  | 2,848,000 | 2,563,000 | 1,289,000
Home mortgage |  |  |  |  |  |  |  |  |  |  |
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,185,000 |  |  |  | 1,667,000 | 2,185,000 | 1,667,000 | 1,653,000
Provision for (reversal of) loan losses |  |  |  |  |  |  |  |  | 706,000 | 518,000 | 14,000
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ending balance | 2,891,000 |  |  |  | 2,185,000 |  |  |  | 2,891,000 | 2,185,000 | 1,667,000
Consumer |  |  |  |  |  |  |  |  |  |  |
Analysis of allowance for loan losses |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 19,000 |  |  |  | $ 34,000 | 19,000 | 34,000 | 33,000
Provision for (reversal of) loan losses |  |  |  |  |  |  |  |  | (10,000) | (16,000) | 0
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 4,000 | 1,000 | 1,000
Ending balance | $ 13,000 |  |  |  | $ 19,000 |  |  |  | $ 13,000 | $ 19,000 | $ 34,000

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