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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 5,180,378   $ 5,120,664
Deferred fees and discounts 554   512
Allowance for credit losses (77,084)   (53,355)
Net loans $ 5,103,848 $ 5,067,821 5,067,821
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required 80.00%    
Real Estate | Real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 4,211,978   4,192,069
Real Estate | Residential 1-4 family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 2,161,894   2,178,135
Real Estate | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 852,120   824,830
Real Estate | Home equity line of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 1,095,677   1,092,125
Real Estate | Residential land      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 13,720   14,704
Real Estate | Commercial construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 79,377   70,605
Real Estate | Residential construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 9,190   11,670
Commercial | Commercial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 722,647   670,674
Consumer | Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 245,753   $ 257,921