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Derivatives (Derivatives Associated With Interest Rate Risk Management Activities) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Mar. 31, 2014 Customer Interest Rate Contracts [Member] | Mar. 31, 2013 Customer Interest Rate Contracts [Member] | Mar. 31, 2014 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member] | Mar. 31, 2013 Customer Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member] | Mar. 31, 2014 Offsetting Upstream Interest Rate Contracts [Member] | Mar. 31, 2013 Offsetting Upstream Interest Rate Contracts [Member] | Mar. 31, 2014 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member] | Mar. 31, 2013 Offsetting Upstream Interest Rate Contracts [Member] Customer Interest Rate Contracts Hedging [Member] Hedging Instruments And Hedged Items [Member] | Mar. 31, 2014 Interest Rate Swap [Member] Debt [Member] Hedging Instruments [Member] | Mar. 31, 2013 Interest Rate Swap [Member] Debt [Member] Hedging Instruments [Member] | Mar. 31, 2014 Long Term Debt [Member] Debt [Member] Hedged Items [Member] | Mar. 31, 2013 Long Term Debt [Member] Debt [Member] Hedged Items [Member]
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional |  |  |  | $ 1,775,287 | $ 1,477,632 | $ 742,710 | [1] | $ 925,608 | [1] | $ 1,775,287 | $ 1,477,632 | $ 758,882 | [1] | $ 925,608 | [1] | $ 1,254,000 | [2] | $ 1,604,000 | [2] |  |  |  |
Assets |  |  |  | 76,173 | 119,866 | 26,742 | [1] | 49,941 | [1] | 7,103 | 1,327 | 2,310 | [1] | 330 | [1] | 50,092 | [2] | 85,114 | [2] |  |  |  |
Liabilities |  |  |  | 7,103 | 1,327 | 2,310 | [1] | 330 | [1] | 76,173 | 119,866 | 27,242 | [1] | 50,741 | [1] | 16,409 | [2] | 7,427 | [2] |  |  |  |
Gains/(Losses) |  |  |  |  |  | (645) | [1] | (5,313) | [1] |  |  | 645 | [1] | 5,713 | [1] | 389 | [2] | (17,574) | [2] |  |  |  |
Term borrowings | 1,507,048 | 1,739,859 | 2,197,864 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,254,000 | [2],[3] | 1,604,000 | [2],[3]
Gains/(Losses) related to term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (389) | [2],[4] | $ 17,574 | [2],[4]
[1] | Gains/losses included in the Other expense section of the Consolidated Condensed Statements of Income.
[2] | Gains/losses included in the All other income and commissions section of the Consolidated Condensed Statements of Income.
[3] | Represents par value of term borrowings being hedged.
[4] | Represents gains and losses attributable to changes in fair value due to interest rate risk as designated in ASC 815-20 hedging relationships.

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- Definition Gain Loss Related To Changes In Fair Value Of Term Borrowings Due To Interest Rate Risk + References No definition available. + Details
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- Definition Gains Losses Related To Interest Rate Derivatives + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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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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