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Derivatives - Derivatives Associated With Interest Rate Risk Management Activities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Customer interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | $ 2,200,080 | $ 2,026,753
Assets | 7,861 | 22,097
Liabilities | 55,392 | 18,323
Offsetting upstream interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 2,200,080 | 2,026,753
Assets | 7,904 | 17,931
Liabilities | 8,244 | 20,720
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Customer interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 1,871,936 | 1,608,912
Assets | 3,792 | 11,644
Liabilities | 50,992 | 19,780
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Offsetting upstream interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 1,871,936 | 1,608,912
Assets | 14,182 | 18,473
Liabilities | 2,608 | 11,019
Debt Hedging | Hedging Instruments And Hedged Items | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 900,000 | 900,000
Assets | 189 | 371
Debt Hedging | Hedging Instruments And Hedged Items | Term borrowings, Par |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | 900,000 | 900,000
Debt Hedging | Hedging Instruments And Hedged Items | Term borrowings, Cumulative fair value hedging adjustments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | (21,782) | (13,472)
Debt Hedging | Hedging Instruments And Hedged Items | Term borrowings, Unamortized premium/(discount) and issuance costs |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | (2,699) | (3,910)
Debt Hedging | Hedging Instruments And Hedged Items | Total carrying value |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | $ 875,519 | $ 882,618

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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 Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 No definition available. + 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 No definition available. + Details
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