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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,747,756 $ 4,743,619
Less: Deferred fees and discounts (3,122) (4,926)
Allowance for loan losses (56,356) (55,533)
Net loans $ 4,688,278 4,683,160
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 $ 3,896,900 3,873,346
Residential 1-4 family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,061,549 2,048,051
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 808,900 800,395
Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 883,135 863,163
Residential land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 16,009 18,889
Commercial construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 116,548 126,768
Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 10,759 16,080
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 649,657 692,051
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 201,199 $ 178,222