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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 5,083,656 $ 4,843,634
Less: Deferred fees and discounts 680 (613)
Allowance for loan losses (53,040) (52,119)
Net loans $ 5,031,296 4,790,902
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required 80.00%  
Real Estate | Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,175,702 3,989,741
Real Estate | Residential 1-4 family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,183,888 2,143,397
Real Estate | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 810,971 748,398
Real Estate | Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 1,079,262 978,237
Real Estate | Residential land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 15,095 13,138
Real Estate | Commercial construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 76,382 92,264
Real Estate | Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 10,104 14,307
Commercial | Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 638,213 587,891
Consumer | Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 269,741 $ 266,002