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Bank segment - Collateral-dependent loans (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | $ 5,325,770 | $ 5,345,226
Real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 4,167,255 | 4,239,745
Real estate | Residential 1-4 family |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 2,107,537 | 2,144,239
Real estate | Commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,012,968 | 983,865
Real estate | Home equity line of credit |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 901,462 | 963,578
Real estate | Residential land |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 17,468 | 15,617
Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,010,004 | 936,748
Residential real estate property | Real estate | Residential 1-4 family |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 2,782 | 2,541
Residential real estate property | Real estate | Home equity line of credit |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 1,587 | 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 | 2,828 | 2,875
Collateral Pledged |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 8,386 | 8,217
Collateral Pledged | Real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | 7,497 | 7,283
Business Assets | Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Collateral-dependent loans, amortized cost | $ 889 | $ 934

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