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Bank segment - Allowance for loan commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Allowance for loan commitments: |  |  |  |
Beginning balance | $ 3,650 | $ 8,100 | $ 4,300 | $ 1,741
Provision | 250 | (500) | (400) | 4,300
Ending balance | 3,900 | 7,600 | 3,900 | 7,600
Real estate | Home equity line of credit |  |  |  |
Allowance for loan commitments: |  |  |  |
Beginning balance | 400 | 300 | 300 | 392
Provision | 0 | 0 | 100 | 0
Ending balance | 400 | 300 | 400 | 300
Real estate | Commercial construction |  |  |  |
Allowance for loan commitments: |  |  |  |
Beginning balance | 2,400 | 7,500 | 3,000 | 931
Provision | 300 | (800) | (300) | 4,024
Ending balance | 2,700 | 6,700 | 2,700 | 6,700
Commercial |  |  |  |
Allowance for loan commitments: |  |  |  |
Beginning balance | 850 | 300 | 1,000 | 418
Provision | (50) | 300 | (200) | 276
Ending balance | $ 800 | $ 600 | $ 800 | 600
Impact of adoption of ASU No. 2016-13 |  |  |  |
Allowance for loan commitments: |  |  |  |
Beginning balance |  |  |  | 1,559
Impact of adoption of ASU No. 2016-13 | Real estate | Home equity line of credit |  |  |  |
Allowance for loan commitments: |  |  |  |
Beginning balance |  |  |  | (92)
Impact of adoption of ASU No. 2016-13 | Real estate | Commercial construction |  |  |  |
Allowance for loan commitments: |  |  |  |
Beginning balance |  |  |  | 1,745
Impact of adoption of ASU No. 2016-13 | Commercial |  |  |  |
Allowance for loan commitments: |  |  |  |
Beginning balance |  |  |  | $ (94)

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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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