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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Ending balance | $ 22,677 | $ 21,379 | $ 18,960 | $ 15,961
Ending balance: individually evaluated for impairment | 777 | 1,179 | 766 |
Ending balance: collectively evaluated for impairment | 21,900 | 20,200 | 18,194 |
Loans receivable: |  |  |  |
Ending balance | 1,938,240 | 1,823,266 | 1,693,065 |
Ending balance: individually evaluated for impairment | 10,120 | 9,641 | 10,722 |
Ending balance: collectively evaluated for impairment | 1,928,120 | 1,813,625 | 1,682,343 |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 6,888 | 5,516 | 5,513 | 4,452
Ending balance: individually evaluated for impairment | 363 | 50 | 159 |
Ending balance: collectively evaluated for impairment | 6,525 | 5,466 | 5,354 |
Loans receivable: |  |  |  |
Ending balance | 522,957 | 494,134 | 476,199 |
Ending balance: individually evaluated for impairment | 4,658 | 2,237 | 2,463 |
Ending balance: collectively evaluated for impairment | 518,299 | 491,897 | 473,736 |
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 11,496 | 10,736 | 8,944 | 7,548
Ending balance: individually evaluated for impairment | 279 | 403 | 263 |
Ending balance: collectively evaluated for impairment | 11,217 | 10,333 | 8,681 |
Loans receivable: |  |  |  |
Ending balance | 1,011,423 | 907,803 | 786,210 |
Ending balance: individually evaluated for impairment | 3,048 | 3,121 | 4,289 |
Ending balance: collectively evaluated for impairment | 1,008,375 | 904,682 | 781,921 |
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 1,067 | 1,235 | 1,392 | $ 1,000
Ending balance: individually evaluated for impairment |  | 60 | 8 |
Ending balance: collectively evaluated for impairment | 1,067 | 1,175 | 1,384 |
Loans receivable: |  |  |  |
Ending balance | 102,482 | 121,453 | 142,721 |
Ending balance: individually evaluated for impairment | 261 | 212 | 177 |
Ending balance: collectively evaluated for impairment | $ 102,221 | $ 121,241 | $ 142,544 |

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