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Loans and allowance for credit losses - Allocation of Allowance for Loan Losses by Loan Category Broken Out Between Loans Individually Evaluated for Impairment and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | $ 895 |  |  |
Collectively evaluated for impairment |  |  |  | 28,571 |  |  |
Acquired with deteriorated credit quality |  |  |  | 1,673 |  |  |
Ending balance | $ 183,973 | $ 113,129 | $ 31,139 | 31,139 | $ 31,464 | $ 30,138 | $ 28,932
Commercial and industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 241 |  |  |
Collectively evaluated for impairment |  |  |  | 4,457 |  |  |
Acquired with deteriorated credit quality |  |  |  | 107 |  |  |
Ending balance | 8,609 | 8,878 |  | 4,805 | 5,170 | 4,923 | 5,348
Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 |  |  |
Collectively evaluated for impairment |  |  |  | 10,192 |  |  |
Acquired with deteriorated credit quality |  |  |  | 2 |  |  |
Ending balance | 63,629 | 35,599 |  | 10,194 | 9,842 | 9,655 | 9,729
Residential real estate: | 1-to-4 family mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 8 |  |  |
Collectively evaluated for impairment |  |  |  | 2,940 |  |  |
Acquired with deteriorated credit quality |  |  |  | 164 |  |  |
Ending balance | 18,298 | 12,463 |  | 3,112 | 3,331 | 3,288 | 3,428
Residential real estate: | Residential line of credit |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 9 |  |  |
Collectively evaluated for impairment |  |  |  | 743 |  |  |
Acquired with deteriorated credit quality |  |  |  | 0 |  |  |
Ending balance | 11,455 | 6,811 |  | 752 | 727 | 755 | 811
Residential real estate: | Multi-family mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 |  |  |
Collectively evaluated for impairment |  |  |  | 544 |  |  |
Acquired with deteriorated credit quality |  |  |  | 0 |  |  |
Ending balance | 7,191 | 4,499 |  | 544 | 574 | 617 | 566
Commercial real estate: | Owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 238 |  |  |
Collectively evaluated for impairment |  |  |  | 3,853 |  |  |
Acquired with deteriorated credit quality |  |  |  | 18 |  |  |
Ending balance | 6,705 | 7,420 |  | 4,109 | 3,709 | 3,512 | 3,132
Commercial real estate: | Non-owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 399 |  |  |
Collectively evaluated for impairment |  |  |  | 3,909 |  |  |
Acquired with deteriorated credit quality |  |  |  | 313 |  |  |
Ending balance | 57,640 | 30,444 |  | 4,621 | 4,927 | 4,478 | 4,149
Consumer and other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 |  |  |
Collectively evaluated for impairment |  |  |  | 1,933 |  |  |
Acquired with deteriorated credit quality |  |  |  | 1,069 |  |  |
Ending balance | $ 10,446 | $ 7,015 |  | $ 3,002 | $ 3,184 | $ 2,910 | $ 1,769

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- Definition For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5275-111524 + Details
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