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Bank segment - Collateral-dependent loans (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Residential real estate property | Real estate | Residential 1-4 family |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | $ 4,454 | $ 2,541
Residential real estate property | Real estate | Home equity line of credit |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,415 | 1,567
Residential real estate property | Real estate | Residential land |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 300 | 300
Commercial real estate | Real estate | Commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,437 | 2,875
Collateral pledged |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 8,446 | 8,217
Collateral pledged | Real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 7,606 | 7,283
Business assets | Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | $ 840 | $ 934

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