Investment Securities (Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses, And Fair Values Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Investments [Line Items]
Total investment securities, Amortized Cost	$ 2,463,025	$ 2,845,432
Total investment securities, Gross Unrealized Gains	68,220	26,772
Total investment securities, Gross Unrealized Losses	32,790	31,278
Total investment securities, Fair Value	2,498,455	2,840,926
Securities Available-for-Sale, Amortized Cost	1,309,521	2,005,330
Securities Available-for-Sale, Gross Unrealized Gains	17,410	18,903
Securities Available-for-Sale, Gross Unrealized Losses	32,453	20,666
Securities Available-for-Sale, Fair Value	1,294,478	2,003,567
Securities Held-to-Maturity, Amortized Cost	1,153,504	840,102
Securities Held-to-Maturity, Unrecognized Holding Gains	50,810	7,869
Securities Held-to-Maturity, Unrecognized Holding Losses	337	10,612
Securities Held-to-Maturity, Fair Value	1,203,977	837,359
U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	500,007	830,269
Securities Available-for-Sale, Gross Unrealized Gains	1,226	1,653
Securities Available-for-Sale, Gross Unrealized Losses	7	6,840
Securities Available-for-Sale, Fair Value	501,226	825,082
Securities Held-to-Maturity, Amortized Cost	99,966	99,921
Securities Held-to-Maturity, Unrecognized Holding Gains	1,406	2,639
Securities Held-to-Maturity, Fair Value	101,372	102,560
State And Municipal Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	1,869	1,875
Securities Available-for-Sale, Gross Unrealized Gains	59
Securities Available-for-Sale, Gross Unrealized Losses		157
Securities Available-for-Sale, Fair Value	1,928	1,718
Securities Held-to-Maturity, Amortized Cost	129,577	130,107
Securities Held-to-Maturity, Unrecognized Holding Gains	7,053
Securities Held-to-Maturity, Unrecognized Holding Losses		8,946
Securities Held-to-Maturity, Fair Value	136,630	121,161
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	325,706	627,574
Securities Available-for-Sale, Gross Unrealized Gains	12,361	14,854
Securities Available-for-Sale, Gross Unrealized Losses	436	123
Securities Available-for-Sale, Fair Value	337,631	642,305
Securities Held-to-Maturity, Amortized Cost	913,990	600,107
Securities Held-to-Maturity, Unrecognized Holding Gains	42,351	5,230
Securities Held-to-Maturity, Unrecognized Holding Losses		1,653
Securities Held-to-Maturity, Fair Value	956,341	603,684
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	412,045	374,489
Securities Available-for-Sale, Gross Unrealized Gains	113	1,374
Securities Available-for-Sale, Gross Unrealized Losses	31,729	6,438
Securities Available-for-Sale, Fair Value	380,429	369,425
Securities Held-to-Maturity, Amortized Cost	9,971	9,967
Securities Held-to-Maturity, Unrecognized Holding Losses	337	13
Securities Held-to-Maturity, Fair Value	9,634	9,954
U.S. Treasury Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost		125,573
Securities Available-for-Sale, Gross Unrealized Losses		6,745
Securities Available-for-Sale, Fair Value		118,828
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	16,184	24,719
Securities Available-for-Sale, Gross Unrealized Gains	540	590
Securities Available-for-Sale, Gross Unrealized Losses	238	115
Securities Available-for-Sale, Fair Value	16,486	25,194
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	172	245
Securities Available-for-Sale, Gross Unrealized Losses	6	5
Securities Available-for-Sale, Fair Value	166	240
Mutual Funds [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	6,000	4,000
Securities Available-for-Sale, Gross Unrealized Gains	48
Securities Available-for-Sale, Gross Unrealized Losses	13	73
Securities Available-for-Sale, Fair Value	6,035	3,927
Preferred Stock Of Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	569	569
Securities Available-for-Sale, Gross Unrealized Gains	1,085	150
Securities Available-for-Sale, Fair Value	1,654	719
Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	45,501	14,549
Securities Available-for-Sale, Gross Unrealized Gains	486	58
Securities Available-for-Sale, Gross Unrealized Losses	24	170
Securities Available-for-Sale, Fair Value	45,963	14,437
Other Equity Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	1,468	1,468
Securities Available-for-Sale, Gross Unrealized Gains	1,492	224
Securities Available-for-Sale, Fair Value	$ 2,960	$ 1,692

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Gross Unrealized Gains of Investment Securities

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Investment Securities Gross Unrealized Losses

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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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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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