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Loans, net and allowance for loan losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Ending balance | $ 28,383 | $ 27,344 | $ 22,677 | $ 21,379
Ending balance: individually evaluated for impairment | 175 | 1,202 | 777 |
Ending balance: collectively evaluated for impairment | 28,208 | 26,142 | 21,900 |
Loans receivable: |  |  |  |
Ending balance | 2,329,173 | 2,177,982 | 1,938,240 |
Ending balance: individually evaluated for impairment | 4,362 | 9,795 | 9,859 |
Ending balance: collectively evaluated for impairment | 2,324,811 | 2,168,187 | 1,928,381 |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 8,453 | 8,734 | 6,888 | 5,516
Ending balance: individually evaluated for impairment | 40 | 947 | 363 |
Ending balance: collectively evaluated for impairment | 8,413 | 7,787 | 6,525 |
Loans receivable: |  |  |  |
Ending balance | 613,127 | 679,286 | 522,957 |
Ending balance: individually evaluated for impairment | 199 | 4,297 | 4,658 |
Ending balance: collectively evaluated for impairment | 612,928 | 674,989 | 518,299 |
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 15,928 | 14,559 | 11,496 | 10,736
Ending balance: individually evaluated for impairment | 109 | 180 | 279 |
Ending balance: collectively evaluated for impairment | 15,819 | 14,379 | 11,217 |
Loans receivable: |  |  |  |
Ending balance | 1,343,539 | 1,137,990 | 1,011,423 |
Ending balance: individually evaluated for impairment | 2,890 | 3,952 | 3,048 |
Ending balance: collectively evaluated for impairment | 1,340,649 | 1,134,038 | 1,008,375 |
Real estate Residential |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 3,209 | 3,129 | 3,226 | 3,892
Ending balance: individually evaluated for impairment | 26 | 75 | 135 |
Ending balance: collectively evaluated for impairment | 3,183 | 3,054 | 3,091 |
Loans receivable: |  |  |  |
Ending balance | 297,624 | 277,414 | 301,378 |
Ending balance: individually evaluated for impairment | 1,273 | 1,546 | 2,153 |
Ending balance: collectively evaluated for impairment | 296,351 | 275,868 | 299,225 |
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 793 | 922 | 1,067 | $ 1,235
Ending balance: collectively evaluated for impairment | 793 | 922 | 1,067 |
Loans receivable: |  |  |  |
Ending balance | 74,883 | 83,292 | 102,482 |
Ending balance: collectively evaluated for impairment | $ 74,883 | $ 83,292 | $ 102,482 |

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