Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Other Assets [Member]	Mar. 31, 2011 Other Assets [Member]	Mar. 31, 2012 Other Assets [Member] Derivatives Designated As Hedging Instruments Under ASC 815 [Member]	Mar. 31, 2012 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]	Mar. 31, 2011 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]	Mar. 31, 2012 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Derivatives [Member]	Mar. 31, 2011 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Derivatives [Member]	Mar. 31, 2012 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Lock Commitments [Member]	Mar. 31, 2011 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Lock Commitments [Member]	Mar. 31, 2012 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Forward Commitments To Sell Mortgage Loans [Member]	Mar. 31, 2011 Other Assets [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Forward Commitments To Sell Mortgage Loans [Member]	Mar. 31, 2012 Other Liabilities [Member]	Dec. 31, 2010 Other Liabilities [Member]	Mar. 31, 2012 Other Liabilities [Member] Derivatives Designated As Hedging Instruments Under ASC 815 [Member]	Mar. 31, 2011 Other Liabilities [Member] Derivatives Designated As Hedging Instruments Under ASC 815 [Member]	Mar. 31, 2012 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]	Dec. 31, 2010 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member]	Mar. 31, 2012 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Derivatives [Member]	Dec. 31, 2010 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Derivatives [Member]	Mar. 31, 2012 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Lock Commitments [Member]	Mar. 31, 2011 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Interest Rate Lock Commitments [Member]	Mar. 31, 2012 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Forward Commitments To Sell Mortgage Loans [Member]	Mar. 31, 2011 Other Liabilities [Member] Derivatives Not Designed As Hedging Instruments Under ASC 815 [Member] Forward Commitments To Sell Mortgage Loans [Member]
Derivative [Line Items]
Interest rate derivatives designated as Cash Flow Hedges, Assets					$ 61	$ 39,159	$ 14,905	$ 34,966	$ 12,361	$ 3,789	$ 1,961	$ 404	$ 583
Interest rate derivatives designated as Cash Flow Hedges, Liabilities																10,178	10,977	36,186	15,100	34,706	12,828	368	567	1,112	1,705
Derivative Assets	39,220	14,905	39,220	14,905
Derivative liabilities	$ (46,364)	$ (26,077)												$ 46,364	$ 26,077