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Bank subsidiary (Details 9) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Credit risk profile based on nonaccrual loans    
Nonaccrual loans $ 68,814 $ 66,754
Accruing loans 90 days or more past due 362 541
Residential 1-4 family
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 30,901 28,298
Commercial real estate
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 3,436 3,436
Home equity line of credit
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 2,799 2,258
Residential land
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 11,672 14,535
Accruing loans 90 days or more past due   205
Commercial loans
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 19,734 17,946
Accruing loans 90 days or more past due 52 28
Consumer loans
    
Credit risk profile based on nonaccrual loans    
Nonaccrual loans 272 281
Accruing loans 90 days or more past due $ 310 $ 308