Auction Rate Certificates Not Subject To Any Additional Other Than Temporary Impairment Charges Fair Value

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Carrying Value Action Rate Securities Above Investment Grade

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Carrying Value Action Rate Securities rated below investment grade or not rated by any ratings agency.

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Carrying value of auction rate securities with credit ratings of AAA.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by corporate entities.

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This element represents the carrying value of student loan auction rate securities guaranteed by the U.S. government

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Guaranteed Student Loan Auction Rate Securities Percentage

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Number Of ARC's

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Number of Trust Preferred Securities Below Investment Grade.

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Other Than Temporary Investments Cost Basis

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Other Than Temporary Investments Fair Value

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Percentage Action Rate Securities Above Investment Grade

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Percentage of Auction Rate Securities rated below investment grade or not rated by any ratings agency.

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Percentage of auction rate securities with credit ratings of AAA.

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Percentage of Actual Defaults Of Other Than Temporarily Impaired ARCs

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This represents percentage of below investment grade-rated auction rate securities whose principal payments are guaranteed by the Federal government.

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For pooled trust preferred securities, the expected weighted average additional deferrals as a percentage of original collateral used as a basis for determining these securities' fair value under the Corporation's discounted cash flow model.

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Ratio Of Total Underlying ARC Collateral To Total Bond Values

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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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The fair value of available-for-sale securities that serve as collateral for borrowings.

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The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The increases or decreases in the market value of unsold securities whose gains or losses were included in earnings, and which, were not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Investment Securities Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
Investment Securities Narrative (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Other than Temporary Impairment Losses, Investments	$ 509,000	$ 2,428,000	$ 1,601,000	$ 12,013,000
Number Of ARC's	2
Percentage of Actual Defaults Of Other Than Temporarily Impaired ARCs	16.00%		16.00%
Ratio Of Total Underlying ARC Collateral To Total Bond Values	85.00%		85.00%
Available-for-sale Securities Pledged as Collateral	1,900,000,000		1,900,000,000		1,900,000,000
Amortized cost	2,716,977,000		2,716,977,000		2,822,965,000
Available for sale	2,769,823,000		2,769,823,000		2,853,733,000
Available-for-sale Securities, Amortized Cost Basis	2,716,977,000		2,716,977,000		2,822,965,000
Securities available for sale	2,769,823,000		2,769,823,000		2,853,733,000
Pooled trust preferred securities actual weighted average cumulative defaults and deferrals			39.00%
Pooled trust preferred securities expected weighted average cumulative defaults			19.00%
Domestic Corporate debt securities	122,400,000		122,400,000
Auction Rate Certificates Not Subject To Any Additional Other Than Temporary Impairment Charges Fair Value	241,000,000		241,000,000
Equity Securities [Member]
Restricted equity securities issued by the Federal Home Loan Bank and Federal Reserve Bank	85,400,000		85,400,000		96,400,000
Amortized cost	123,483,000		123,483,000		133,570,000
Available for sale	120,366,000		120,366,000		136,468,000
Available-for-sale Securities, Amortized Cost Basis	123,483,000		123,483,000		133,570,000
Securities available for sale	120,366,000		120,366,000		136,468,000
Equity Securities Financial Institution [Member]
Amortized cost	31,100,000		31,100,000
Available for sale	27,900,000		27,900,000
Available-for-sale Securities, Amortized Cost Basis	31,100,000		31,100,000
Securities available for sale	27,900,000		27,900,000
Auction Rate Securities [Member]
Other than Temporary Impairment Losses, Investments	292,000
Other Than Temporary Investments Cost Basis	1,600,000		1,600,000
Other Than Temporary Investments Fair Value	1,100,000		1,100,000
Amortized cost	255,472,000		255,472,000		271,645,000
Available for sale	240,702,000		240,702,000		260,679,000
Carrying value auction rate securities rated AAA	144,000,000		144,000,000
Percentage auction rate securities rated AAA			60.00%
Carrying value auction rate securities below investment grade	49,000,000		49,000,000
Percentage Auction Rate Securities Below Investment Grade	20.00%		20.00%
US Government Guaranteed student loans below investment grade	28,000,000		28,000,000
Percentage US Government guaranteed student loans below investment grade	58.00%		58.00%
US Government Guaranteed student loan auction rate securities	214,000,000		214,000,000
US Government Guaranteed student loan auction rate securities percentage			89.00%
Available-for-sale Securities, Amortized Cost Basis	255,472,000		255,472,000		271,645,000
Securities available for sale	240,702,000		240,702,000		260,679,000
Auction Rate Securities [Member] \| External Credit Rating, Rated Above Investment Grade [Member]
Carrying value action rate securities above investment grade			192,000,000
Percentage action rate securities above investment grade			80.00%
Pooled Trust Preferred Securities [Member]
Other than Temporary Impairment Losses, Investments	53,000		1,400,000
Number of Trust Preferred Securities	10		10
Pooled Trust Preferred Securities [Member] \| External Credit Rating, Rated Below Investment Grade [Member]
Amortized cost	5,800,000		5,800,000
Available for sale	4,700,000		4,700,000
Number of Trust Preferred Securities	9		9
Available-for-sale Securities, Amortized Cost Basis	5,800,000		5,800,000
Securities available for sale	4,700,000		4,700,000
Single-issuer Trust Preferred Securities [Member]
Unrealized Gain (Loss) on Securities			(8,500,000)
Single-issuer Trust Preferred Securities [Member] \| External Credit Rating, Rated Below Investment Grade [Member]
Amortized cost	42,100,000		42,100,000
Available for sale	38,700,000		38,700,000
Number of Trust Preferred Securities	13		13
Available-for-sale Securities, Amortized Cost Basis	42,100,000		42,100,000
Securities available for sale	38,700,000		38,700,000
Single-issuer Trust Preferred Securities [Member] \| External Credit Rating, BBB [Member]
Amortized cost	10,800,000		10,800,000
Available for sale	9,000,000		9,000,000
Available-for-sale Securities, Amortized Cost Basis	10,800,000		10,800,000
Securities available for sale	$ 9,000,000		$ 9,000,000