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Bank segment - Collateral-dependent loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	$ 5,450,802	$ 5,120,664
Real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	4,160,943	4,192,069
Real estate | Residential 1-4 family
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	2,123,226	2,178,135
Real estate | Home equity line of credit
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	1,065,264	1,092,125
Real estate | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	92,904	70,605
Commercial
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	1,073,829	$ 670,674
Residential real estate property | Real estate | Residential 1-4 family
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	1,795
Residential real estate property | Real estate | Home equity line of credit
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	1,387
Commercial real estate | Real estate | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	2,289
Business assets | Commercial
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	90
Collateral Pledged
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	5,561
Collateral Pledged | Real estate
Financing Receivable, Nonaccrual [Line Items]
Collateral-dependent loans, amortized cost	$ 5,471

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