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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,754,672 $ 4,671,577
Less: Deferred fees and discounts (313) (809)
Allowance for loan losses (54,127) (53,637)
Net loans $ 4,700,232 4,617,131
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 $ 3,933,371 3,903,185
Residential 1-4 family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,110,489 2,118,047
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 733,749 733,106
Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 949,872 913,052
Residential land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 12,982 15,797
Commercial construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 112,838 108,273
Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 13,441 14,910
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 574,243 544,828
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 247,058 $ 223,564