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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 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |
Ending balance | $ 25,686 | $ 22,677 | $ 22,105 | $ 21,379
Ending balance: individually evaluated for impairment | 1,226 | 777 |  |
Ending balance: collectively evaluated for impairment | 24,460 | 21,900 |  |
Loans receivable: |  |  |  |
Ending balance | 2,023,155 | 1,938,240 |  |
Ending balance: individually evaluated for impairment | 11,224 | 10,120 |  |
Ending balance: collectively evaluated for impairment | 2,011,931 | 1,928,120 |  |
Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 7,969 | 6,888 | 5,955 | 5,516
Ending balance: individually evaluated for impairment | 764 | 363 |  |
Ending balance: collectively evaluated for impairment | 7,205 | 6,525 |  |
Loans receivable: |  |  |  |
Ending balance | 537,949 | 522,957 |  |
Ending balance: individually evaluated for impairment | 5,662 | 4,658 |  |
Ending balance: collectively evaluated for impairment | 532,287 | 518,299 |  |
Real estate Commercial |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 13,007 | 11,496 | 11,074 | 10,736
Ending balance: individually evaluated for impairment | 270 | 279 |  |
Ending balance: collectively evaluated for impairment | 12,737 | 11,217 |  |
Loans receivable: |  |  |  |
Ending balance | 1,082,124 | 1,011,423 |  |
Ending balance: individually evaluated for impairment | 3,526 | 3,048 |  |
Ending balance: collectively evaluated for impairment | 1,078,598 | 1,008,375 |  |
Real estate Residential |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 3,624 | 3,226 | 3,880 | 3,892
Ending balance: individually evaluated for impairment | 192 | 135 |  |
Ending balance: collectively evaluated for impairment | 3,432 | 3,091 |  |
Loans receivable: |  |  |  |
Ending balance | 307,215 | 301,378 |  |
Ending balance: individually evaluated for impairment | 1,835 | 2,153 |  |
Ending balance: collectively evaluated for impairment | 305,380 | 299,225 |  |
Consumer |  |  |  |
Allowance for loan losses: |  |  |  |
Ending balance | 1,086 | 1,067 | $ 1,196 | $ 1,235
Ending balance: collectively evaluated for impairment | 1,086 | 1,067 |  |
Loans receivable: |  |  |  |
Ending balance | 95,867 | 102,482 |  |
Ending balance: individually evaluated for impairment | 201 | 261 |  |
Ending balance: collectively evaluated for impairment | $ 95,666 | $ 102,221 |  |

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