Fair Values (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
Quantitative information about Level 3 fair value measures
Fair value of assets	98,335
Impaired loans - income producing properties
Quantitative information about Level 3 fair value measures
Fair value of assets	93,100
Impaired loans - income producing properties | Discounted cash flow
Quantitative information about Level 3 fair value measures
Discount rate (as a percent)	9.90%
Capitalization rate (as a percent)	8.50%
Average annual percentage market rate growth (as a percent)	1.70%
Average annual increase in occupancy (as a percent)	2.20%
Impaired net lease assets - income producing properties
Quantitative information about Level 3 fair value measures
Fair value of assets	5,235
Impaired net lease assets - income producing properties | Discounted cash flow
Quantitative information about Level 3 fair value measures
Discount rate (as a percent)	10.50%
Capitalization rate (as a percent)	8.50%
Average annual percentage market rate growth (as a percent)	2.50%
Average annual increase in occupancy (as a percent)	12.40%