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Investment Securities (Schedule Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | $ 991,373 | $ 801,147
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 18,265 | 19,530
Securities Available-for-Sale, Gross Unrealized Holding Losses | 2,157 | 32
Securities Available-for-Sale, Estimated Fair Value | 1,007,481 | 820,645
Securities Held-to-Maturity, Amortized Cost | 782,250 | 820,224
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 13,105 | 14,382
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 280 | 32
Securities Held-to-Maturity, Estimated Fair Value | 795,075 | 834,574
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 599,125 | 370,043
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 478 | 1,614
Securities Available-for-Sale, Gross Unrealized Holding Losses | 2,128 |
Securities Available-for-Sale, Estimated Fair Value | 597,475 | 371,657
Obligations Of States And Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 2,616 | 2,616
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 39 | 44
Securities Available-for-Sale, Estimated Fair Value | 2,655 | 2,660
Securities Held-to-Maturity, Amortized Cost | 1,427 | 1,992
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 3 | 5
Securities Held-to-Maturity, Estimated Fair Value | 1,430 | 1,997
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 388,444 | 427,300
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 16,734 | 16,995
Securities Available-for-Sale, Estimated Fair Value | 405,178 | 444,295
Securities Held-to-Maturity, Amortized Cost | 780,823 | 818,232
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 13,102 | 14,377
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 280 | 32
Securities Held-to-Maturity, Estimated Fair Value | 793,645 | 832,577
Other Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 1,188 | 1,188
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 1,014 | 877
Securities Available-for-Sale, Gross Unrealized Holding Losses | 29 | 32
Securities Available-for-Sale, Estimated Fair Value | $ 2,173 | $ 2,033

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