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Loans, net and allowance for credit losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |  |  |
Ending balance | $ 23,010 | $ 23,218 | $ 27,472 | $ 29,822 | $ 29,374 | $ 28,383
Ending balance |  |  | 27,472 |  |  |
Ending balance: individually evaluated for impairment |  |  | 40 |  |  |
Ending balance: individually evaluated for impairment | 42 |  |  |  |  |
Ending balance: collectively evaluated for impairment |  |  | 27,432 |  |  |
Ending balance: collectively evaluated for impairment | 22,968 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 2,870,969 |  |  |  |  |
Ending balance |  |  | 2,730,116 |  |  |
Ending balance: individually evaluated for impairment |  |  | 3,921 |  |  |
Ending balance: collectively evaluated for impairment | 2,867,474 |  | 2,726,195 |  |  |
Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 3,453 |  |  |  |  |
Non-real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 42 |  |  |  |  |
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 2,251 | 2,751 | 4,365 | 6,520 | 6,522 | 7,466
Ending balance |  |  | 4,365 |  |  |
Ending balance: individually evaluated for impairment |  |  | 19 |  |  |
Ending balance: individually evaluated for impairment | 42 |  |  |  |  |
Ending balance: collectively evaluated for impairment |  |  | 4,346 |  |  |
Ending balance: collectively evaluated for impairment | 2,209 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 404,245 |  |  |  |  |
Ending balance |  |  | 433,048 |  |  |
Ending balance: individually evaluated for impairment |  |  | 98 |  |  |
Ending balance: collectively evaluated for impairment | 404,142 |  | 432,950 |  |  |
Commercial | Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 61 |  |  |  |  |
Commercial | Non-real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 42 |  |  |  |  |
Municipal |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 867 | 827 | 1,247 | 1,251 | 1,244 | 987
Ending balance |  |  | 1,247 |  |  |
Ending balance: collectively evaluated for impairment |  |  | 1,247 |  |  |
Ending balance: collectively evaluated for impairment | 867 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 176,935 |  |  |  |  |
Ending balance |  |  | 166,210 |  |  |
Ending balance: collectively evaluated for impairment | 176,935 |  | 166,210 |  |  |
Commercial real estate |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 15,095 | 14,961 | 17,915 | 18,023 | 17,569 | 15,928
Ending balance |  |  | 17,915 |  |  |
Ending balance: collectively evaluated for impairment |  |  | 17,915 |  |  |
Ending balance: collectively evaluated for impairment | 15,095 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 1,846,350 |  |  |  |  |
Ending balance |  |  | 1,709,827 |  |  |
Ending balance: individually evaluated for impairment |  |  | 2,063 |  |  |
Ending balance: collectively evaluated for impairment | 1,844,285 |  | 1,707,764 |  |  |
Commercial real estate | Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 2,065 |  |  |  |  |
Residential real estate |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 3,898 | 3,767 | 3,072 | 3,230 | 3,220 | 3,209
Ending balance |  |  | 3,072 |  |  |
Ending balance: individually evaluated for impairment |  |  | 21 |  |  |
Ending balance: collectively evaluated for impairment |  |  | 3,051 |  |  |
Ending balance: collectively evaluated for impairment | 3,898 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 357,647 |  |  |  |  |
Ending balance |  |  | 330,728 |  |  |
Ending balance: individually evaluated for impairment |  |  | 1,760 |  |  |
Ending balance: collectively evaluated for impairment | 356,320 |  | 328,968 |  |  |
Residential real estate | Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 1,327 |  |  |  |  |
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 899 | $ 912 | 873 | $ 798 | $ 819 | $ 793
Ending balance |  |  | 873 |  |  |
Ending balance: collectively evaluated for impairment |  |  | 873 |  |  |
Ending balance: collectively evaluated for impairment | 899 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 85,792 |  |  |  |  |
Ending balance |  |  | 90,303 |  |  |
Ending balance: collectively evaluated for impairment | $ 85,792 |  | $ 90,303 |  |  |

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