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Bank subsidiary (Details 10) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Credit risk profile based on nonaccrual loans    
Nonaccrual loans $ 50,772 $ 64,887
Accruing loans 90 days or more past due 1,746 373
Residential 1-4 family
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 18,908 26,721
Commercial real estate
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 4,483 6,750
Home equity line of credit
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 1,948 2,349
Residential land
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 3,606 8,561
Accruing loans 90 days or more past due 1,746  
Commercial loans
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 21,308 20,222
Accruing loans 90 days or more past due   131
Consumer loans
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 519 284
Accruing loans 90 days or more past due   $ 242