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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) contract | Mar. 31, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 17 | 7
Outstanding recorded investment | $ 9,265 | $ 17,488
Related allowance | $ 349 | $ 4,567
Real estate | Residential 1-4 family |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 12 | 1
Outstanding recorded investment | $ 8,283 | $ 148
Related allowance | $ 298 | $ 8
Real estate | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 1 | 2
Outstanding recorded investment | $ 482 | $ 16,584
Related allowance | $ 0 | $ 4,281
Real estate | Home equity line of credit |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 1 | 0
Outstanding recorded investment | $ 170 | $ 0
Related allowance | $ 21 | $ 0
Real estate | Residential land |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 1 | 0
Outstanding recorded investment | $ 271 | $ 0
Related allowance | $ 11 | $ 0
Real estate | Commercial construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 0
Outstanding recorded investment | $ 0 | $ 0
Related allowance | $ 0 | $ 0
Real estate | Residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 0
Outstanding recorded investment | $ 0 | $ 0
Related allowance | $ 0 | $ 0
Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 2 | 4
Outstanding recorded investment | $ 59 | $ 756
Related allowance | $ 19 | $ 278
Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 0
Outstanding recorded investment | $ 0 | $ 0
Related allowance | $ 0 | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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