Investment Securities (Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses, And Fair Values Of Investment Securities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Schedule of Investments [Line Items]
Total investment securities, Amortized Cost	$ 2,302,581	$ 2,845,432
Total investment securities, Gross Unrealized Gains	67,906	26,772
Total investment securities, Gross Unrealized Losses	27,190	31,278
Total investment securities, Fair Value	2,343,297	2,840,926
Securities Available-for-Sale, Amortized Cost	1,066,845	2,005,330
Securities Available-for-Sale, Gross Unrealized Gains	16,963	18,903
Securities Available-for-Sale, Gross Unrealized Losses	26,437	20,666
Securities Available-for-Sale, Fair Value	1,057,371	2,003,567
Securities Held-to-Maturity, Amortized Cost	1,235,736	840,102
Securities Held-to-Maturity, Unrecognized Holding Gains	50,943	7,869
Securities Held-to-Maturity, Unrecognized Holding Losses	753	10,612
Securities Held-to-Maturity, Fair Value	1,285,926	837,359
U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	350,015	830,269
Securities Available-for-Sale, Gross Unrealized Gains	1,516	1,653
Securities Available-for-Sale, Gross Unrealized Losses	83	6,840
Securities Available-for-Sale, Fair Value	351,448	825,082
Securities Held-to-Maturity, Amortized Cost	99,955	99,921
Securities Held-to-Maturity, Unrecognized Holding Gains	1,818	2,639
Securities Held-to-Maturity, Fair Value	101,773	102,560
State And Municipal Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	1,870	1,875
Securities Available-for-Sale, Gross Unrealized Gains	25
Securities Available-for-Sale, Gross Unrealized Losses	8	157
Securities Available-for-Sale, Fair Value	1,887	1,718
Securities Held-to-Maturity, Amortized Cost	129,710	130,107
Securities Held-to-Maturity, Unrecognized Holding Gains	3,904
Securities Held-to-Maturity, Unrecognized Holding Losses	216	8,946
Securities Held-to-Maturity, Fair Value	133,398	121,161
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	210,469	627,574
Securities Available-for-Sale, Gross Unrealized Gains	11,057	14,854
Securities Available-for-Sale, Gross Unrealized Losses	508	123
Securities Available-for-Sale, Fair Value	221,018	642,305
Securities Held-to-Maturity, Amortized Cost	996,101	600,107
Securities Held-to-Maturity, Unrecognized Holding Gains	45,221	5,230
Securities Held-to-Maturity, Unrecognized Holding Losses		1,653
Securities Held-to-Maturity, Fair Value	1,041,322	603,684
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	432,582	374,489
Securities Available-for-Sale, Gross Unrealized Gains	534	1,374
Securities Available-for-Sale, Gross Unrealized Losses	25,687	6,438
Securities Available-for-Sale, Fair Value	407,429	369,425
Securities Held-to-Maturity, Amortized Cost	9,970	9,967
Securities Held-to-Maturity, Unrecognized Holding Losses	537	13
Securities Held-to-Maturity, Fair Value	9,433	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	18,194	24,719
Securities Available-for-Sale, Gross Unrealized Gains	611	590
Securities Available-for-Sale, Gross Unrealized Losses	120	115
Securities Available-for-Sale, Fair Value	18,685	25,194
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Amortized Cost	177	245
Securities Available-for-Sale, Gross Unrealized Losses	6	5
Securities Available-for-Sale, Fair Value	171	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	79
Securities Available-for-Sale, Gross Unrealized Losses		73
Securities Available-for-Sale, Fair Value	6,079	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	1,783	150
Securities Available-for-Sale, Fair Value	2,352	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	598	58
Securities Available-for-Sale, Gross Unrealized Losses	25	170
Securities Available-for-Sale, Fair Value	46,074	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	760	224
Securities Available-for-Sale, Fair Value	$ 2,228	$ 1,692

Amortized Cost of Investment Securities

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Gross Unrealized Gains of Investment Securities

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Investment Securities Gross Unrealized Losses

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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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This item represents the gross unrealized losses 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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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration