Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Collateral dependent impaired loans
Information about valuation method, inputs and assumptions for nonrecurring Level 3 fair value measurements
Fair value of assets	$ 10,045
Other real estate owned
Information about valuation method, inputs and assumptions for nonrecurring Level 3 fair value measurements
Fair value of assets	4,078
Private equity and alternative investments
Information about valuation method, inputs and assumptions for nonrecurring Level 3 fair value measurements
Fair value of assets	$ 258