Investment Securities (Schedule Of Amortized Cost And Estimated Fair Value By Maturity Of Investment Securities) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Securities Available for Sale, Weighted Average Yield, Within one year or less	0.87%
Securities Available for Sale, Weighted Average Yield, One through five years	2.23%
Securities Available for Sale, Weighted Average Yield, After five through ten years	2.31%
Securities Available for Sale, Weighted Average Yield, Over ten years	2.25%
Securities Available for Sale, Weighted Average Yield, Totals	2.23%
Securities Available for Sale, Amortized Cost, Within one year or less	$ 49,411
Securities Available for Sale, Amortized Cost, One through five years	134,716
Securities Available for Sale, Amortized Cost, After five through ten years	554,364
Securities Available for Sale, Amortized Cost, Over ten years	1,035,251
Securities Available for Sale, Amortized Cost, Totals	1,773,742
Securities Available for Sale, Fair Value, Within one year or less	49,623
Securities Available for Sale, Fair Value, One through five years	137,017
Securities Available for Sale, Fair Value, After five through ten years	569,516
Securities Available for Sale, Fair Value, Over ten years	1,056,590
Securities Available for Sale, Fair Value, Totals	1,812,746
Securities Held to Maturity, Weighted Average Yield, Within one year or less	1.51%
Securities Held to Maturity, Weighted Average Yield, One through five years	2.06%
Securities Held to Maturity, Weighted Average Yield, After five through ten years	3.04%
Securities Held to Maturity, Weighted Average Yield, Over ten years	3.05%
Securities Held to Maturity, Weighted Average Yield, Totals	2.51%
Securities Held to Maturity, Amortized Cost, Within one year or less	30,699
Securities Held to Maturity, Amortized Cost, One through five years	55,612
Securities Held to Maturity, Amortized Cost, After five through ten years	21,805
Securities Held to Maturity, Amortized Cost, Over ten years	80,283
Securities Held to Maturity, Amortized Cost, Totals	188,399
Securities Held to Maturity, Fair Value, Within one year or less	30,968
Securities Held to Maturity, Fair Value, One through five years	57,147
Securities Held to Maturity, Fair Value, After five through ten years	23,063
Securities Held to Maturity, Fair Value, Over ten years	83,454
Securities Held to Maturity, Fair Value, Totals	$ 194,632

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