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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Allowance for loan losses: |  |  |  |
Beginning Balance | $ 26,739 | $ 26,957 | $ 27,344 | $ 22,677
Charge-offs | (466) | (1,542) | (851) | (2,957)
Recoveries | 20 | 119 | 200 | 514
Provisions (credits) | 400 | 1,050 |  | 6,350
Ending balance | 26,693 | 26,584 | 26,693 | 26,584
Increase (decrease) in charge offs due to a partial write down of a non-accrual commercial relationship |  |  | 1,500 |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance | 8,520 | 8,487 | 8,734 | 6,888
Charge-offs | (446) | (1,354) | (461) | (2,339)
Recoveries | 4 | 51 | 83 | 349
Provisions (credits) | (164) | 1,271 | (442) | 3,557
Ending balance | 7,914 | 8,455 | 7,914 | 8,455
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance | 14,281 | 13,855 | 14,559 | 11,496
Charge-offs | (12) | (66) | (252) | (113)
Recoveries | 1 | 14 | 67 | 14
Provisions (credits) | 519 | (5) | 415 | 2,401
Ending balance | 14,789 | 13,798 | 14,789 | 13,798
Real estate Residential |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance | 3,069 | 3,567 | 3,129 | 3,226
Charge-offs |  | (71) | (24) | (206)
Recoveries |  | 9 | 2 | 22
Provisions (credits) | 92 | (159) | 54 | 304
Ending balance | 3,161 | 3,346 | 3,161 | 3,346
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning Balance | 869 | 1,048 | 922 | 1,067
Charge-offs | (8) | (51) | (114) | (299)
Recoveries | 15 | 45 | 48 | 129
Provisions (credits) | (47) | (57) | (27) | 88
Ending balance | $ 829 | $ 985 | $ 829 | $ 985

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