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Loans and Allowance for Loan Losses - Schedule of Allowance for Loan Losses and Recorded Investment by Portfolio Segment and Impairment Methodology (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
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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 | Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Individually Evaluated for Impairment | $ 312,000 |  |  |  | $ 417,000 |  |  |  | $ 312,000 | $ 417,000 |  |
Allowance for Loan Collectively Evaluated for Impairment | 15,811,000 |  |  |  | 14,935,000 |  |  |  | 15,811,000 | 14,935,000 |  |
Allowance for loan losses, Total | 16,123,000 |  |  |  | 15,352,000 |  |  |  | 16,123,000 | 15,352,000 | $ 10,050,000 | $ 9,636,000
Loans Individually Evaluated for Impairment | 1,124,000 |  |  |  | 504,000 |  |  |  | 1,124,000 | 504,000 |  |
Loans Collectively Evaluated for Impairment | 1,312,895,000 |  |  |  | 1,099,232,000 |  |  |  | 1,312,895,000 | 1,099,232,000 |  |
Loans, Total | 1,314,019,000 |  |  |  | 1,099,736,000 |  |  |  | 1,314,019,000 | 1,099,736,000 |  |
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 |
Accrued interest receivable | 4,400,000 |  |  |  | 4,400,000 |  |  |  | 4,400,000 | 4,400,000 |  |
Uncollectible Accrued Interest Receivable |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 205,000 | 643,000 | 0 |
Commercial real estate |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Allowance for Loan Collectively Evaluated for Impairment | 8,150,000 |  |  |  | 8,505,000 |  |  |  | 8,150,000 | 8,505,000 |  |
Allowance for loan losses, Total | 8,150,000 |  |  |  | 8,505,000 |  |  |  | 8,150,000 | 8,505,000 | 6,000,000 | 4,805,000
Loans Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Loans Collectively Evaluated for Impairment | 701,450,000 |  |  |  | 651,684,000 |  |  |  | 701,450,000 | 651,684,000 |  |
Loans, Total | 701,450,000 |  |  |  | 651,684,000 |  |  |  | 701,450,000 | 651,684,000 |  |
SBA loans—real estate |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Allowance for Loan Collectively Evaluated for Impairment | 2,022,000 |  |  |  | 1,802,000 |  |  |  | 2,022,000 | 1,802,000 |  |
Allowance for loan losses, Total | 2,022,000 |  |  |  | 1,802,000 |  |  |  | 2,022,000 | 1,802,000 | 939,000 | 894,000
Loans Individually Evaluated for Impairment | 812,000 |  |  |  | 0 |  |  |  | 812,000 | 0 |  |
Loans Collectively Evaluated for Impairment | 219,287,000 |  |  |  | 136,224,000 |  |  |  | 219,287,000 | 136,224,000 |  |
Loans, Total | 220,099,000 |  |  |  | 136,224,000 |  |  |  | 220,099,000 | 136,224,000 |  |
SBA loans—non-real estate |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Individually Evaluated for Impairment | 0 |  |  |  | 87,000 |  |  |  | 0 | 87,000 |  |
Allowance for Loan Collectively Evaluated for Impairment | 199,000 |  |  |  | 191,000 |  |  |  | 199,000 | 191,000 |  |
Allowance for loan losses, Total | 199,000 |  |  |  | 278,000 |  |  |  | 199,000 | 278,000 | 121,000 | 505,000
Loans Individually Evaluated for Impairment | 0 |  |  |  | 174,000 |  |  |  | 0 | 174,000 |  |
Loans Collectively Evaluated for Impairment | 55,759,000 |  |  |  | 74,977,000 |  |  |  | 55,759,000 | 74,977,000 |  |
Loans, Total | 55,759,000 |  |  |  | 75,151,000 |  |  |  | 55,759,000 | 75,151,000 |  |
Commercial and industrial ("C&I") |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Individually Evaluated for Impairment | 312,000 |  |  |  | 330,000 |  |  |  | 312,000 | 330,000 |  |
Allowance for Loan Collectively Evaluated for Impairment | 2,536,000 |  |  |  | 2,233,000 |  |  |  | 2,536,000 | 2,233,000 |  |
Allowance for loan losses, Total | 2,848,000 |  |  |  | 2,563,000 |  |  |  | 2,848,000 | 2,563,000 | 1,289,000 | 1,746,000
Loans Individually Evaluated for Impairment | 312,000 |  |  |  | 330,000 |  |  |  | 312,000 | 330,000 |  |
Loans Collectively Evaluated for Impairment | 162,231,000 |  |  |  | 106,977,000 |  |  |  | 162,231,000 | 106,977,000 |  |
Loans, Total | 162,543,000 |  |  |  | 107,307,000 |  |  |  | 162,543,000 | 107,307,000 |  |
Home mortgage |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Allowance for Loan Collectively Evaluated for Impairment | 2,891,000 |  |  |  | 2,185,000 |  |  |  | 2,891,000 | 2,185,000 |  |
Allowance for loan losses, Total | 2,891,000 |  |  |  | 2,185,000 |  |  |  | 2,891,000 | 2,185,000 | 1,667,000 | 1,653,000
Loans Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Loans Collectively Evaluated for Impairment | 173,303,000 |  |  |  | 128,212,000 |  |  |  | 173,303,000 | 128,212,000 |  |
Loans, Total | 173,303,000 |  |  |  | 128,212,000 |  |  |  | 173,303,000 | 128,212,000 |  |
Consumer |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Loans Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Allowance for Loan Collectively Evaluated for Impairment | 13,000 |  |  |  | 19,000 |  |  |  | 13,000 | 19,000 |  |
Allowance for loan losses, Total | 13,000 |  |  |  | 19,000 |  |  |  | 13,000 | 19,000 | $ 34,000 | $ 33,000
Loans Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Loans Collectively Evaluated for Impairment | 865,000 |  |  |  | 1,158,000 |  |  |  | 865,000 | 1,158,000 |  |
Loans, Total | $ 865,000 |  |  |  | $ 1,158,000 |  |  |  | $ 865,000 | $ 1,158,000 |  |

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