Bank subsidiary (Details 9) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Credit risk profile based on nonaccrual loans
Nonaccrual loans	$ 62,036	$ 66,754
Accruing loans 90 days or more past due	712	541
Residential 1-4 family
Credit risk profile based on nonaccrual loans
Nonaccrual loans	30,945	28,298
Commercial real estate
Credit risk profile based on nonaccrual loans
Nonaccrual loans	3,079	3,436
Home equity line of credit
Credit risk profile based on nonaccrual loans
Nonaccrual loans	2,587	2,258
Residential land
Credit risk profile based on nonaccrual loans
Nonaccrual loans	7,637	14,535
Accruing loans 90 days or more past due	180	205
Commercial loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	17,619	17,946
Accruing loans 90 days or more past due	117	28
Consumer loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	169	281
Accruing loans 90 days or more past due	$ 415	$ 308