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Derivatives (Derivatives Associated With Interest Rate Risk Management Activities) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Term borrowings |  | $ 1,341,186,000 | $ 1,491,138,000 | $ 1,341,186,000 | $ 1,491,138,000 | $ 1,880,105,000
Customer Interest Rate Contracts [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional |  | 1,670,717,000 | 1,731,047,000 | 1,670,717,000 | 1,731,047,000 |
Assets |  | 82,905,000 | 69,878,000 | 82,905,000 | 69,878,000 |
Liabilities |  | 1,512,000 | 5,778,000 | 1,512,000 | 5,778,000 |
Customer Interest Rate Contracts [Member] | Customer Interest Rate Contracts Hedging [Member] | Hedging Instruments And Hedged Items [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional | [1] | 790,321,000 | 742,065,000 | 790,321,000 | 742,065,000 |
Assets | [1] | 34,507,000 | 25,039,000 | 34,507,000 | 25,039,000 |
Liabilities | [1] | 210,000 | 1,128,000 | 210,000 | 1,128,000 |
Gains/(Losses) | [1] | 10,558,000 | (3,235,000) | 8,643,000 | (1,166,000) |
Offsetting Upstream Interest Rate Contracts [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional |  | 1,670,717,000 | 1,731,047,000 | 1,670,717,000 | 1,731,047,000 |
Assets |  | 1,512,000 | 5,778,000 | 1,512,000 | 5,778,000 |
Liabilities |  | 82,905,000 | 69,878,000 | 82,905,000 | 69,878,000 |
Offsetting Upstream Interest Rate Contracts [Member] | Customer Interest Rate Contracts Hedging [Member] | Hedging Instruments And Hedged Items [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional | [1] | 790,321,000 | 742,065,000 | 790,321,000 | 742,065,000 |
Assets | [1] | 210,000 | 1,128,000 | 210,000 | 1,128,000 |
Liabilities | [1] | 35,007,000 | 25,539,000 | 35,007,000 | 25,539,000 |
Gains/(Losses) | [1] | (10,558,000) | 3,235,000 | (8,643,000) | 1,166,000 |
Interest Rate Swap [Member] | Debt [Member] | Hedging Instruments [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Notional | [2] | 1,150,000,000 | 1,254,000,000 | 1,150,000,000 | 1,254,000,000 |
Assets | [2] | 16,960,000 | 32,711,000 | 16,960,000 | 32,711,000 |
Liabilities | [2] |  | 9,787,000 |  | 9,787,000 |
Gains/(Losses) | [2] | 3,247,000 | (7,074,000) | (6,593,000) | (10,313,000) |
Long Term Debt [Member] | Debt [Member] | Hedged Items [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Term borrowings | [2],[3] | 1,150,000,000 | 1,254,000,000 | 1,150,000,000 | 1,254,000,000 |
Gains/(Losses) related to term borrowings | [2],[4] | $ (3,167,000) | $ 7,074,000 | $ 6,645,000 | $ 10,313,000 |
[1] | Gains/losses included in the All o ther 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 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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