Bank subsidiary (Details 11)	9 Months Ended
	Sep. 30, 2012
Residential loan
Troubled debt restructurings
Period of deferral of principal repayments	1 year
Period of temporary reduction in principal and/ or interest rate	2 years
Land loans
Troubled debt restructurings
Period of interest-only monthly payment term loan	3 years
Land loans | Minimum
Troubled debt restructurings
Extension of maturity date	1 year
Land loans | Maximum
Troubled debt restructurings
Extension of maturity date	3 years