Investment Securities (Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Securities Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investment [Line Items]
Available-for-Sale, Amortized Cost	$ 2,030,801	$ 1,953,842
Available-for-Sale, Unrealized Gains	66,067	41,246
Available-for-Sale, Unrealized Losses	(25,592)	(34,866)
Available-for-Sale, Fair Value	2,071,276	1,960,222
Held-to-Maturity, Amortized Cost	484,590	638,210
Held-to-Maturity, Unrealized Gains	23,287	4,825
Held-to-Maturity, Unrealized Losses	(178)	(17,392)
Held-to-Maturity, Fair Value	507,699	625,643
U.S. Treasury [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost	65,221	62,206
Available-for-Sale, Unrealized Gains	548	371
Available-for-Sale, Unrealized Losses	0	(27)
Available-for-Sale, Fair Value	65,769	62,550
U.S. Government-Sponsored Entities And Agencies [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost	171,629	315,922
Available-for-Sale, Unrealized Gains	1,621	1,612
Available-for-Sale, Unrealized Losses	(65)	(2,401)
Available-for-Sale, Fair Value	173,185	315,133
Held-to-Maturity, Amortized Cost	177,159	303,265
Held-to-Maturity, Unrealized Gains	11,434	2,247
Held-to-Maturity, Unrealized Losses	0	(3,703)
Held-to-Maturity, Fair Value	188,593	301,809
Mortgage-Backed Securities - Agency [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost	1,153,629	922,005
Available-for-Sale, Unrealized Gains	28,687	22,926
Available-for-Sale, Unrealized Losses	(61)	(485)
Available-for-Sale, Fair Value	1,182,255	944,446
Held-to-Maturity, Amortized Cost	84,075	117,013
Held-to-Maturity, Unrealized Gains	3,305	2,577
Held-to-Maturity, Unrealized Losses	0	(510)
Held-to-Maturity, Fair Value	87,380	119,080
Mortgage-Backed Securities - Non-Agency [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost	90,355
Available-for-Sale, Unrealized Gains	418
Available-for-Sale, Unrealized Losses	(4,873)
Available-for-Sale, Fair Value	85,900
Mortgage-Backed Securities - Non-Agency Group 1 [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost		134,168
Available-for-Sale, Unrealized Gains		1,018
Available-for-Sale, Unrealized Losses		(8,380)
Available-for-Sale, Fair Value		126,806
States And Political Subdivisions [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost	376,609	343,970
Available-for-Sale, Unrealized Gains	26,428	7,503
Available-for-Sale, Unrealized Losses	(193)	(2,549)
Available-for-Sale, Fair Value	402,844	348,924
Held-to-Maturity, Amortized Cost	216,345	217,381
Held-to-Maturity, Unrealized Gains	8,548	1
Held-to-Maturity, Unrealized Losses	(176)	(13,003)
Held-to-Maturity, Fair Value	224,717	204,379
Pooled Trust Preferred Securities [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost	25,461	27,368
Available-for-Sale, Unrealized Gains	0	0
Available-for-Sale, Unrealized Losses	(18,134)	(18,968)
Available-for-Sale, Fair Value	7,327	8,400
Other Securities [Member]
Investment [Line Items]
Available-for-Sale, Amortized Cost	147,897	148,203
Available-for-Sale, Unrealized Gains	8,365	7,816
Available-for-Sale, Unrealized Losses	(2,266)	(2,056)
Available-for-Sale, Fair Value	153,996	153,963
Held-to-Maturity, Amortized Cost	7,011	551
Held-to-Maturity, Unrealized Gains	0	0
Held-to-Maturity, Unrealized Losses	(2)	(176)
Held-to-Maturity, Fair Value	$ 7,009	$ 375

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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+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

- Definition

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.

+ References+ Details

- Definition

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.

+ References

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

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.

+ References+ Details

- Definition

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.

+ References+ Details

- Definition

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.

+ References+ Details