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Loans and Allowance for Loan Losses - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans receivable | $ 1,314,019 | $ 1,099,736 |  |
Allowance for loan losses | (16,123) | (15,352) | $ (10,050) | $ (9,636)
Loans receivable, net | 1,297,896 | 1,084,384 |  |
Deferred loan fees, unamortized premiums and unaccreted discounts | 7,000 | 5,900 |  |
Real Estate | Commercial real estate |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans receivable | 701,450 | 651,684 |  |
Real Estate | SBA Loans—Real Estate |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans receivable | 220,099 | 136,224 |  |
SBA loans—non-real estate |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans receivable | 55,759 | 75,151 |  |
Allowance for loan losses | (199) | (278) | (121) | (505)
SBA loans—non-real estate | PPP loans |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Loans receivable, net | 40,600 | 64,900 |  |
Commercial and industrial ("C&I") |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans receivable | 162,543 | 107,307 |  |
Allowance for loan losses | (2,848) | (2,563) | (1,289) | (1,746)
Home mortgage |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans receivable | 173,303 | 128,212 |  |
Allowance for loan losses | (2,891) | (2,185) | (1,667) | (1,653)
Consumer |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Gross loans receivable | 865 | 1,158 |  |
Allowance for loan losses | $ (13) | $ (19) | $ (34) | $ (33)

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