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Loans, net and allowance for loan losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for loan losses: |  |  |
Beginning Balance | $ 27,344 | $ 22,677 | $ 21,379
Charge-offs | (956) | (3,479) | (5,067)
Recoveries | 245 | 746 | 265
Provisions (credits) | 1,750 | 7,400 | 6,100
Ending balance | 28,383 | 27,344 | 22,677
Allowance for credit losses increase (decrease) | 1,100 |  |
Increase (decrease) in charge offs due to a partial write down of a non-accrual commercial relationship | 1,500 |  |
Write-offs net of recoveries | 700 |  |
Commercial |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 8,734 | 6,888 | 5,516
Charge-offs | (492) | (2,771) | (3,314)
Recoveries | 89 | 525 | 69
Provisions (credits) | 122 | 4,092 | 4,617
Ending balance | 8,453 | 8,734 | 6,888
Commercial | Small Business Line of Credit |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (400) | (900) |
Recoveries |  | 200 |
Real estate Commercial |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 14,559 | 11,496 | 10,736
Charge-offs | (252) | (144) | (817)
Recoveries | 68 | 16 | 1
Provisions (credits) | 1,553 | 3,191 | 1,576
Ending balance | 15,928 | 14,559 | 11,496
Real estate Residential |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 3,129 | 3,226 | 3,892
Charge-offs | (24) | (247) | (477)
Recoveries | 7 | 57 | 29
Provisions (credits) | 97 | 93 | (218)
Ending balance | 3,209 | 3,129 | 3,226
Consumer |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 922 | 1,067 | 1,235
Charge-offs | (188) | (317) | (459)
Recoveries | 81 | 148 | 166
Provisions (credits) | (22) | 24 | 125
Ending balance | $ 793 | $ 922 | $ 1,067

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