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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,858,270 $ 4,843,634
Less: Deferred fees and discounts (90) (613)
Allowance for loan losses (54,297) (52,119)
Net loans $ 4,803,883 4,790,902
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required 80.00%  
Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,015,598 3,989,741
Residential 1-4 family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,159,886 2,143,397
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 737,489 748,398
Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 995,624 978,237
Residential land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 12,941 13,138
Commercial construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 98,734 92,264
Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 10,924 14,307
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 576,235 587,891
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 266,437 $ 266,002