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Loans and allowance for credit losses - Individually Assessed Allowance (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | $ 183,973 | $ 113,129 | $ 31,139 | $ 31,139 | $ 31,464 | $ 30,138 | $ 28,932
Individually assessed allowance for credit loss | 2,291 |  |  |  |  |  |
Commercial and industrial |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 8,609 | 8,878 |  | 4,805 | 5,170 | 4,923 | 5,348
Individually assessed allowance for credit loss | 668 |  |  |  |  |  |
Construction |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 63,629 | 35,599 |  | 10,194 | 9,842 | 9,655 | 9,729
Individually assessed allowance for credit loss | 0 |  |  |  |  |  |
Residential real estate: | 1-to-4 family mortgage |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 18,298 | 12,463 |  | 3,112 | 3,331 | 3,288 | 3,428
Individually assessed allowance for credit loss | 0 |  |  |  |  |  |
Residential real estate: | Residential line of credit |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 11,455 | 6,811 |  | 752 | 727 | 755 | 811
Individually assessed allowance for credit loss | 9 |  |  |  |  |  |
Residential real estate: | Multi-family mortgage |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 7,191 | 4,499 |  | 544 | 574 | 617 | 566
Individually assessed allowance for credit loss | 0 |  |  |  |  |  |
Commercial real estate: | Owner occupied |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 6,705 | 7,420 |  | 4,109 | 3,709 | 3,512 | 3,132
Individually assessed allowance for credit loss | 34 |  |  |  |  |  |
Commercial real estate: | Non-owner occupied |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 57,640 | 30,444 |  | 4,621 | 4,927 | 4,478 | 4,149
Individually assessed allowance for credit loss | 1,544 |  |  |  |  |  |
Consumer and other |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 10,446 | $ 7,015 |  | $ 3,002 | $ 3,184 | $ 2,910 | $ 1,769
Individually assessed allowance for credit loss | 36 |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 12,644 |  |  |  |  |  |
Real Estate | Commercial and industrial |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Real Estate | Construction |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 1,817 |  |  |  |  |  |
Real Estate | Residential real estate: | 1-to-4 family mortgage |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 190 |  |  |  |  |  |
Real Estate | Residential real estate: | Residential line of credit |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 1,195 |  |  |  |  |  |
Real Estate | Residential real estate: | Multi-family mortgage |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Real Estate | Commercial real estate: | Owner occupied |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 928 |  |  |  |  |  |
Real Estate | Commercial real estate: | Non-owner occupied |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 8,181 |  |  |  |  |  |
Real Estate | Consumer and other |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 333 |  |  |  |  |  |
Financial Assets and Equipment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 4,697 |  |  |  |  |  |
Financial Assets and Equipment | Commercial and industrial |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 4,697 |  |  |  |  |  |
Financial Assets and Equipment | Construction |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Financial Assets and Equipment | Residential real estate: | 1-to-4 family mortgage |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Financial Assets and Equipment | Residential real estate: | Residential line of credit |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Financial Assets and Equipment | Residential real estate: | Multi-family mortgage |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Financial Assets and Equipment | Commercial real estate: | Owner occupied |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Financial Assets and Equipment | Commercial real estate: | Non-owner occupied |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | 0 |  |  |  |  |  |
Financial Assets and Equipment | Consumer and other |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Loans | $ 0 |  |  |  |  |  |

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