Investment Securities Narrative (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Number Pooled Trust Securities	10
Available-for-sale Securities Pledged as Collateral	$ 1,800,000,000	$ 1,900,000,000
Amortized cost	2,633,226,000	2,822,965,000
Available for sale	2,673,298,000	2,853,733,000
Number Of ARC's	2
Percentage of Actual Defaults Of Other Than Temporarily Impaired ARCs	18.00%
Ratio Of Total Underlying ARC Collateral To Total Bond Values	83.00%
Available-for-sale Securities, Amortized Cost Basis	2,633,226,000	2,822,965,000
Securities available for sale	2,673,298,000	2,853,733,000
Pooled trust preferred securities actual weighted average cumulative defaults and deferrals	38.00%
Pooled trust preferred securities expected weighted average cumulative defaults	17.00%
Domestic Corporate debt securities	123,300,000
Equity Securities [Member]
Restricted equity securities issued by the Federal Home Loan Bank and Federal Reserve Bank	82,500,000	96,400,000
Amortized cost	117,486,000	133,570,000
Available for sale	117,050,000	136,468,000
Available-for-sale Securities, Amortized Cost Basis	117,486,000	133,570,000
Securities available for sale	117,050,000	136,468,000
Equity Securities Financial Institution [Member]
Amortized cost		28,300,000
Available for sale		27,900,000
Available-for-sale Securities, Amortized Cost Basis		28,300,000
Securities available for sale		27,900,000
Auction Rate Securities [Member]
Amortized cost	240,852,000	271,645,000
Available for sale	225,211,000	260,679,000
Other than Temporary Impairment Losses, Investments	292,000
Other Than Temporary Investments Cost Basis	1,600,000
Other Than Temporary Investments Fair Value	1,100,000
Carrying value auction rate securities below investment grade	48,000,000
Percentage Auction Rate Securities Below Investment Grade	21.00%
US Government Guaranteed student loans below investment grade	28,000,000
Percentage US Government guaranteed student loans below investment grade	59.00%
US Government Guaranteed student loan auction rate securities	202,000,000
US Government Guaranteed student loan auction rate securities percentage	90.00%
Available-for-sale Securities, Amortized Cost Basis	240,852,000	271,645,000
Securities available for sale	225,211,000	260,679,000
Auction Rate Securities [Member] \| External Credit Rating, Rated Above Investment Grade [Member]
Carrying value action rate securities above investment grade	177,000,000
Percentage action rate securities above investment grade	79.00%
Auction Rate Securities [Member] \| External Credit Rated AAA [Member]
Carrying value auction rate securities rated AAA	135,000,000
Percentage auction rate securities rated AAA	60.00%
Pooled Trust Preferred Securities [Member] \| External Credit Rating, Rated Below Investment Grade [Member]
Amortized cost	5,800,000
Available for sale	4,700,000
Number of Trust Preferred Securities	9
Available-for-sale Securities, Amortized Cost Basis	5,800,000
Securities available for sale	4,700,000
Single-issuer Trust Preferred Securities [Member]
Unrealized Gain (Loss) on Securities	(9,500,000)
Single-issuer Trust Preferred Securities [Member] \| External Credit Rating, Rated Below Investment Grade [Member]
Amortized cost	41,100,000
Available for sale	38,700,000
Number of Trust Preferred Securities	12
Available-for-sale Securities, Amortized Cost Basis	41,100,000
Securities available for sale	38,700,000
Single-issuer Trust Preferred Securities [Member] \| External Credit Rating, BBB [Member]
Amortized cost	8,300,000
Available for sale	6,500,000
Available-for-sale Securities, Amortized Cost Basis	8,300,000
Securities available for sale	$ 6,500,000

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