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Derivatives (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Collateral cash receivables | $ 101,800,000 | $ 163,200,000 |
Collateral cash payables | 82,500,000 | 124,300,000 |
Total trading revenues | 49,600,000 | 68,000,000 |
Noncallable senior debt maturing date | 2015-12-01 |  |
Other Long-term Debt | 1,507,048,000 | 2,197,864,000 | 1,739,859,000
Hedged amount of foreign currency denominated loans | 800,000 | 600,000 |
Visa Class B Shares [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative liabilities related to sale | 4,900,000 | 2,100,000 |
Parent Company [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Hedged held-to-maturity trust preferred loans principal balance | 6,500,000 | 21,500,000 |
Derivative Instruments With Accelerated Termination Provisions [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Collateral received | 200,000,000 | 255,300,000 |
Securities posted collateral | 27,800,000 | 37,800,000 |
Net fair value of derivative assets with adjustable posting thresholds | 121,900,000 | 208,600,000 |
Net fair value of derivative liabilities with adjustable posting thresholds | 22,600,000 | 35,800,000 |
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Shortcut Method [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net fair value of interest rate derivatives hedging | 34,100,000 | 60,500,000 |
Other Long-term Debt | 554,000,000 | 904,000,000 |
Long Term Debt Hedged With Fair Value Interest Rate Derivatives Using Long Haul Method [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net fair value of interest rate derivatives hedging | 16,000,000 | 24,600,000 |
Other Long-term Debt | 500,000,000 | 500,000,000 |
Subordinated Debentures Subject To Mandatory Redemption Amount [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net fair value of interest rate derivatives hedging subordinated debt | 16,400,000 | 7,400,000 |
Other Long-term Debt | 200,000,000 | 200,000,000 |
Hedge Of Held To Maturity Trust Preferred Loans [Member] | Parent Company [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net fair value of interest rate derivatives hedging subordinated debt | 900,000 | 1,500,000 |
Additional Derivative Agreements [Member] | Derivative Instruments With Adjustable Collateral Posting Thresholds [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Collateral received | 200,000,000 | 255,300,000 |
Securities posted collateral | 92,500,000 | 153,900,000 |
Net fair value of derivative assets with adjustable posting thresholds | 121,900,000 | 210,100,000 |
Net fair value of derivative liabilities with adjustable posting thresholds | $ 90,300,000 | $ 156,400,000 |

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- Definition Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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