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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,742,680 $ 4,671,577
Less: Deferred fees and discounts (656) (809)
Allowance for loan losses (53,895) (53,637)
Net loans $ 4,688,129 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 $ 3,944,051 3,903,185
Residential 1-4 family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,116,121 2,118,047
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 766,522 733,106
Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 914,941 913,052
Residential land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 16,569 15,797
Commercial construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 114,535 108,273
Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 15,363 14,910
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 568,371 544,828
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 230,258 $ 223,564