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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 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |  |  |
Ending balance | $ 23,218 | $ 25,444 | $ 27,472 | $ 29,374 | $ 28,407 | $ 28,383
Ending balance |  |  | 27,472 |  |  |
Ending balance: individually evaluated for impairment |  |  | 40 |  |  |
Ending balance: individually evaluated for impairment | 12 |  |  |  |  |
Ending balance: collectively evaluated for impairment |  |  | 27,432 |  |  |
Ending balance: collectively evaluated for impairment | 23,206 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 2,843,238 |  |  |  |  |
Ending balance |  |  | 2,730,116 |  |  |
Ending balance: individually evaluated for impairment |  |  | 3,921 |  |  |
Ending balance: collectively evaluated for impairment | 2,841,312 |  | 2,726,195 |  |  |
Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 1,914 |  |  |  |  |
Non-real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 12 |  |  |  |  |
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 2,751 | 2,481 | 4,365 | 6,522 | 6,427 | 7,466
Ending balance |  |  | 4,365 |  |  |
Ending balance: individually evaluated for impairment |  |  | 19 |  |  |
Ending balance: individually evaluated for impairment | 12 |  |  |  |  |
Ending balance: collectively evaluated for impairment |  |  | 4,346 |  |  |
Ending balance: collectively evaluated for impairment | 2,739 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 437,012 |  |  |  |  |
Ending balance |  |  | 433,048 |  |  |
Ending balance: individually evaluated for impairment |  |  | 98 |  |  |
Ending balance: collectively evaluated for impairment | 436,991 |  | 432,950 |  |  |
Commercial | Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 9 |  |  |  |  |
Commercial | Non-real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 12 |  |  |  |  |
Municipal |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 827 | 2,318 | 1,247 | 1,244 | 1,166 | 987
Ending balance |  |  | 1,247 |  |  |
Ending balance: collectively evaluated for impairment |  |  | 1,247 |  |  |
Ending balance: collectively evaluated for impairment | 827 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 172,875 |  |  |  |  |
Ending balance |  |  | 166,210 |  |  |
Ending balance: collectively evaluated for impairment | 172,875 |  | 166,210 |  |  |
Commercial real estate |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 14,961 | 15,692 | 17,915 | 17,569 | 16,789 | 15,928
Ending balance |  |  | 17,915 |  |  |
Ending balance: collectively evaluated for impairment |  |  | 17,915 |  |  |
Ending balance: collectively evaluated for impairment | 14,961 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 1,794,355 |  |  |  |  |
Ending balance |  |  | 1,709,827 |  |  |
Ending balance: individually evaluated for impairment |  |  | 2,063 |  |  |
Ending balance: collectively evaluated for impairment | 1,793,508 |  | 1,707,764 |  |  |
Commercial real estate | Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 847 |  |  |  |  |
Residential real estate |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 3,767 | 3,868 | 3,072 | 3,220 | 3,255 | 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 | 3,767 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 348,911 |  |  |  |  |
Ending balance |  |  | 330,728 |  |  |
Ending balance: individually evaluated for impairment |  |  | 1,760 |  |  |
Ending balance: collectively evaluated for impairment | 347,853 |  | 328,968 |  |  |
Residential real estate | Real estate |  |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 1,058 |  |  |  |  |
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Ending balance | 912 | $ 1,085 | 873 | $ 819 | $ 770 | $ 793
Ending balance |  |  | 873 |  |  |
Ending balance: collectively evaluated for impairment |  |  | 873 |  |  |
Ending balance: collectively evaluated for impairment | 912 |  |  |  |  |
Loans receivable: |  |  |  |  |  |
Loans | 90,085 |  |  |  |  |
Ending balance |  |  | 90,303 |  |  |
Ending balance: collectively evaluated for impairment | $ 90,085 |  | $ 90,303 |  |  |

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