Bank subsidiary (Details 11) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Credit risk profile based on nonaccrual loans
Nonaccrual loans	$ 66,754	$ 58,855
Accruing loans 90 days or more past due	541	965
Residential 1-4 family
Credit risk profile based on nonaccrual loans
Nonaccrual loans	28,298	36,420
Commercial real estate
Credit risk profile based on nonaccrual loans
Nonaccrual loans	3,436
Home equity line of credit
Credit risk profile based on nonaccrual loans
Nonaccrual loans	2,258	1,659
Residential land
Credit risk profile based on nonaccrual loans
Nonaccrual loans	14,535	15,479
Accruing loans 90 days or more past due	205	581
Commercial loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	17,946	4,956
Accruing loans 90 days or more past due	28	64
Consumer loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	281	341
Accruing loans 90 days or more past due	$ 308	$ 320