Derivative and Hedging Activities (Details Textuals) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on free standing derivatives	$ 1,000,000	$ (100,000)
Notional Amount of Foreign Currency Derivatives	89,000,000		97,000,000
Interest rate swap maturity				100,000,000
Derivative and Hedging Activities (Textuals) [Abstract]
Investment securities and cash equivalents pledged as collateral	80,000,000		85,000,000
Deferred After Tax Loss	500,000		1,000,000
Net gain on mortgage derivatives	6,000,000		200,000
Capital market fees [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on free standing derivatives			(2,000,000)
Capital market fees [Member] | Interest rate-related instruments - customer and mirror [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on free standing derivatives	$ 755,000	$ (63,000)