Securities (Schedule Of Amortized Cost And Fair Value Of Securities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	$ 4,508,807	$ 1,445,721
Securities available for sale, Gross Unrealized Gains	98,517	51,701
Securities available for sale, Gross Unrealized Losses	2,489	8,537
Securities available for sale, Fair Value	4,604,835	1,488,885
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	10,408	10,797
Securities available for sale, Gross Unrealized Gains	43	52
Securities available for sale, Gross Unrealized Losses		5
Securities available for sale, Fair Value	10,451	10,844
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	248,921	106,054
Securities available for sale, Gross Unrealized Gains	1,218	971
Securities available for sale, Gross Unrealized Losses		434
Securities available for sale, Fair Value	250,139	106,591
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	301,076	181,747
Securities available for sale, Gross Unrealized Gains	13,323	4,107
Securities available for sale, Gross Unrealized Losses	95	5,411
Securities available for sale, Fair Value	314,304	180,443
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	2,492,885	761,704
Securities available for sale, Gross Unrealized Gains	56,854	38,032
Securities available for sale, Gross Unrealized Losses	1,354	50
Securities available for sale, Fair Value	2,548,385	799,686
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	1,434,160	367,662
Securities available for sale, Gross Unrealized Gains	25,424	6,880
Securities available for sale, Gross Unrealized Losses	916	2,491
Securities available for sale, Fair Value	1,458,668	372,051
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	16,914	14,329
Securities available for sale, Gross Unrealized Gains	978	999
Securities available for sale, Gross Unrealized Losses	53	43
Securities available for sale, Fair Value	17,839	15,285
Other Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Amortized Cost	4,443	3,428
Securities available for sale, Gross Unrealized Gains	677	660
Securities available for sale, Gross Unrealized Losses	71	103
Securities available for sale, Fair Value	$ 5,049	$ 3,985

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details