Derivatives and Hedging Activities (Details 2) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	$ 349	$ 282
Mortgage loan commitments [Member] | Other income [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	1,980	107
Forward sales contracts [Member] | Other income [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	(1,646)	175
Foreign exchange contract [Member] | Other income [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	15	0
Other [Member] | Other Expenses [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	$ 0	$ 0