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Bank segment - Collateral-dependent loans (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | $ 5,494,110 | $ 5,120,664
Real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 4,261,537 | 4,192,069
Real estate | Residential 1-4 family |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 2,195,093 | 2,178,135
Real estate | Home equity line of credit |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,028,011 | 1,092,125
Real estate | Commercial construction |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 112,930 | 70,605
Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,042,435 | $ 670,674
Residential real estate property | Real estate | Residential 1-4 family |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 2,057 |
Residential real estate property | Real estate | Home equity line of credit |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,555 |
Business Assets | Real estate | Commercial construction |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 0 |
Collateral Pledged |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 3,612 |
Collateral Pledged | Real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 3,612 |
Commercial real estate | Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | $ 0 |

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