Investment Securities (Schedule Of Amortized Cost And Estimated Fair Value By Maturity Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Investment Securities [Abstract]
Securities Available for Sale, Weighted Average Yield, Within one year or less	1.43%
Securities Available for Sale, Amortized Cost, Within one year or less	$ 40,084
Securities Available for Sale, Fair Value, Within one year or less	40,352
Securities Held to Maturity, Weighted Average Yield, Within one year or less	1.21%
Securities Held to Maturity, Amortized Cost, Within one year or less	20,258
Securities Held to Maturity, Fair Value, Within one year or less	20,324
Securities Available for Sale, Weighted Average Yield, One through five years	2.02%
Securities Available for Sale, Amortized Cost, One through five years	138,747
Securities Available for Sale, Fair Value, One through five years	140,902
Securities Held to Maturity, Weighted Average Yield, One through five years	2.08%
Securities Held to Maturity, Amortized Cost, One through five years	70,363
Securities Held to Maturity, Fair Value, One through five years	72,187
Securities Available for Sale, Weighted Average Yield, After five through ten years	2.39%
Securities Available for Sale, Amortized Cost, After five through ten years	555,529
Securities Available for Sale, Fair Value, After five through ten years	569,060
Securities Held to Maturity, Weighted Average Yield, After five through ten years	3.07%
Securities Held to Maturity, Amortized Cost, After five through ten years	22,653
Securities Held to Maturity, Fair Value, After five through ten years	23,834
Securities Available for Sale, Weighted Average Yield, Over ten years	2.44%
Securities Available for Sale, Amortized Cost, Over ten years	1,040,853
Securities Available for Sale, Fair Value, Over ten years	1,060,709
Securities Held to Maturity, Weighted Average Yield, Over ten years	3.12%
Securities Held to Maturity, Amortized Cost, Over ten years	76,810
Securities Held to Maturity, Fair Value, Over ten years	79,838
Securities Available for Sale, Weighted Average Yield, Totals	2.37%
Securities Available for Sale, Amortized Cost, Totals	1,775,213
Securities Available for Sale, Fair Value, Totals	1,811,023
Securities Held to Maturity, Weighted Average Yield, Totals	2.53%
Securities Held to Maturity, Amortized Cost, Totals	190,084
Securities Held to Maturity, Fair Value, Totals	$ 196,183

Fair Value of Securities Available for Sale, Total

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