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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2021 USD ($) contract | Sep. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 3 | 2 | 26 | 12
Outstanding recorded investment | $ 3,075 | $ 52 | $ 13,843 | $ 16,752
Related allowance | $ 304 | $ 45 | $ 588 | $ 4,222
Real estate | Residential 1-4 family |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 1 | 0 | 16 | 1
Outstanding recorded investment | $ 442 | $ 0 | $ 10,363 | $ 146
Related allowance | $ 81 | $ 0 | $ 309 | $ 7
Real estate | Commercial real estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 2
Outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 16,149
Related allowance | $ 0 | $ 0 | $ 0 | $ 4,019
Real estate | Home equity line of credit |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 2
Outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 22
Related allowance | $ 0 | $ 0 | $ 0 | $ 1
Real estate | Residential land |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 1 | 0 | 3 | 2
Outstanding recorded investment | $ 247 | $ 0 | $ 802 | $ 228
Related allowance | $ 11 | $ 0 | $ 37 | $ 15
Real estate | Commercial construction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0
Related allowance | $ 0 | $ 0 | $ 0 | $ 0
Real estate | Residential construction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0
Related allowance | $ 0 | $ 0 | $ 0 | $ 0
Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 1 | 2 | 7 | 5
Outstanding recorded investment | $ 2,386 | $ 52 | $ 2,678 | $ 207
Related allowance | $ 212 | $ 45 | $ 242 | $ 180
Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0
Related allowance | $ 0 | $ 0 | $ 0 | $ 0

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