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Bank segment (Details 9) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Credit risk profile based on nonaccrual loans    
Nonaccrual loans $ 36,914 $ 48,521
Accruing loans 90 days or more past due 525 0
Residential 1-4 family
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 20,499 19,679
Commercial real estate
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 596 4,439
Home equity line of credit
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 1,105 2,060
Residential land
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 2,798 3,161
Accruing loans 90 days or more past due 525  
Commercial loans
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 11,414 18,781
Accruing loans 90 days or more past due   0
Consumer loans
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 502 401
Accruing loans 90 days or more past due   $ 0