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Bank segment - Loans receivable (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 5,008,145 $ 4,843,634
Less: Deferred fees and discounts 344 (613)
Allowance for loan losses (58,425) (52,119)
Net loans $ 4,950,064 4,790,902
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required 80.00%  
Real Estate Segment [Member] | Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 4,108,672 3,989,741
Real Estate Segment [Member] | Residential 1-4 family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 2,189,976 2,143,397
Real Estate Segment [Member] | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 790,174 748,398
Real Estate Segment [Member] | Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 1,036,985 978,237
Real Estate Segment [Member] | Residential land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 14,696 13,138
Real Estate Segment [Member] | Commercial construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 68,676 92,264
Real Estate Segment [Member] | Residential construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 8,165 14,307
Commercial Segment [Member] | Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 626,524 587,891
Consumer Segment [Member] | Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable $ 272,949 $ 266,002