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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,678,144 $ 4,743,619
Less: Deferred fees and discounts (1,863) (4,926)
Allowance for loan losses (53,047) (55,533)
Net loans $ 4,623,234 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 $ 3,876,904 3,873,346
Residential 1-4 family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,066,023 2,048,051
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 745,583 800,395
Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 905,249 863,163
Residential land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 18,611 18,889
Commercial construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 128,407 126,768
Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 13,031 16,080
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 589,669 692,051
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 211,571 $ 178,222