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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 22,677 |  |  |  | $ 21,379 | $ 22,677 | $ 21,379 | $ 18,960
Charge-offs |  |  |  |  |  |  |  |  | (3,479) | (5,067) | (2,354)
Recoveries |  |  |  |  |  |  |  |  | 746 | 265 | 573
Provisions | $ 1,050 | $ 1,050 | $ 1,800 | 3,500 | $ 4,000 | $ 700 | $ 350 | 1,050 | 7,400 | 6,100 | 4,200
Ending balance | 27,344 |  |  |  | 22,677 |  |  |  | 27,344 | 22,677 | 21,379
Allowance for credit losses increase (decrease) |  |  |  |  |  |  |  |  | 4,600 |  |
Write-offs net of recoveries |  |  |  |  |  |  |  |  | 2,700 |  |
Commercial |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 6,888 |  |  |  | 5,516 | 6,888 | 5,516 | 5,513
Charge-offs |  |  |  |  |  |  |  |  | (2,771) | (3,314) | (154)
Recoveries |  |  |  |  |  |  |  |  | 525 | 69 | 137
Provisions |  |  |  |  |  |  |  |  | 4,092 | 4,617 | 20
Ending balance | 8,734 |  |  |  | 6,888 |  |  |  | 8,734 | 6,888 | 5,516
Partial write down |  |  |  |  |  |  |  |  | 1,100 |  |
Charge-offs originated from one employee and deemed impaired |  |  |  |  |  |  |  |  |  | 2,300 |
Loans receivable specific reserve |  |  |  |  | 300 |  |  |  |  | 300 |
Commercial | Small Business Line of Credit |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (900) | (2,300) |
Recoveries |  |  |  |  |  |  |  |  | 200 |  |
Commercial | Separate Credit |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  | 200 |  |
Commercial | Other Commercial Loans |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Charge-offs |  |  |  |  |  |  |  |  |  | (1,000) |
Real estate Commercial |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 11,496 |  |  |  | 10,736 | 11,496 | 10,736 | 8,944
Charge-offs |  |  |  |  |  |  |  |  | (144) | (817) | (1,250)
Recoveries |  |  |  |  |  |  |  |  | 16 | 1 | 136
Provisions |  |  |  |  |  |  |  |  | 3,191 | 1,576 | 2,906
Ending balance | 14,559 |  |  |  | 11,496 |  |  |  | 14,559 | 11,496 | 10,736
Real estate Residential |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 3,226 |  |  |  | 3,892 | 3,226 | 3,892 | 3,111
Charge-offs |  |  |  |  |  |  |  |  | (247) | (477) | (405)
Recoveries |  |  |  |  |  |  |  |  | 57 | 29 | 98
Provisions |  |  |  |  |  |  |  |  | 93 | (218) | 1,088
Ending balance | 3,129 |  |  |  | 3,226 |  |  |  | 3,129 | 3,226 | 3,892
Consumer |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 1,067 |  |  |  | $ 1,235 | 1,067 | 1,235 | 1,392
Charge-offs |  |  |  |  |  |  |  |  | (317) | (459) | (545)
Recoveries |  |  |  |  |  |  |  |  | 148 | 166 | 202
Provisions |  |  |  |  |  |  |  |  | 24 | 125 | 186
Ending balance | $ 922 |  |  |  | $ 1,067 |  |  |  | $ 922 | $ 1,067 | $ 1,235

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