Bank subsidiary (Details 10) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Credit risk profile based on nonaccrual loans
Nonaccrual loans	$ 46,337	$ 48,521
Accruing loans 90 days or more past due	52	0
Residential 1-4 family
Credit risk profile based on nonaccrual loans
Nonaccrual loans	18,795	19,679
Commercial real estate
Credit risk profile based on nonaccrual loans
Nonaccrual loans	4,395	4,439
Home equity line of credit
Credit risk profile based on nonaccrual loans
Nonaccrual loans	2,060	2,060
Residential land
Credit risk profile based on nonaccrual loans
Nonaccrual loans	3,136	3,161
Accruing loans 90 days or more past due	52
Commercial loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	17,641	18,781
Accruing loans 90 days or more past due		0
Consumer loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	310	401
Accruing loans 90 days or more past due		$ 0