Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended				3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Interest Rate Swap [Member] derivative_contracts	Dec. 31, 2012 Interest Rate Lock Commitments [Member]	Dec. 31, 2011 Interest Rate Lock Commitments [Member]	Dec. 31, 2012 Cash Flow Hedging [Member]	Dec. 31, 2011 Cash Flow Hedging [Member]	Sep. 30, 2010 Cash Flow Hedging [Member] Interest Rate Lock Commitments [Member]	Jul. 30, 2010 Cash Flow Hedging [Member] Interest Rate Lock Commitments [Member]	Dec. 31, 2012 Fair Value Hedging [Member] Interest Rate Swap [Member] derivative_instruments
Derivative Instruments and Hedging Activities [Line Items]
Number of interest rate derivatives held					5							5
Notional amount of interest rate derivatives					$ 300,000,000						$ 100,000,000	$ 300,000,000
Maturity date										Sep. 01, 2010		Oct. 01, 2013
Net gain (loss) on derivative instruments	129,000	129,000	388,000	388,000				388,000	388,000	(2,600,000)
Net gain (loss) on derivative instruments, after tax								244,000	244,000	(1,600,000)
Cash flow hedge loss reclassified to interest expense during the current period.						388,000	388,000
Gross amount of existing losses recorded in 'Accumulated other comprehensive income (loss), ' to be reclassified during the next 12 months						517,000
Net amount of existing losses recorded in 'Accumulated other comprehensive income (loss)', to be reclassified during the next 12 months, net of tax						326,000
Derivative, Amount of Hedged Item												300,000,000
Variable weighted average rate												1.19%
Fixed interest rate												2.85%
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments												(3,000,000)
Fair value of interest rate fair value hedges												3,700,000
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge												$ (3,000,000)
Fair Value Hedge Ineffectiveness is Immaterial	The net gain or loss recorded in earnings as a result of hedge ineffectiveness related to the designated fair value hedges was immaterial	The net gain or loss recorded in earnings as a result of hedge ineffectiveness related to the designated fair value hedges was immaterial	The net gain or loss recorded in earnings as a result of hedge ineffectiveness related to the designated fair value hedges was immaterial	The net gain or loss recorded in earnings as a result of hedge ineffectiveness related to the designated fair value hedges was immaterial