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Derivatives - Derivatives Associated With Interest Rate Risk Management Activities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Customer interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | $ 2,279,361 | $ 2,271,448
Assets | 30,632 | 18,744
Liabilities | 14,245 | 27,768
Offsetting upstream interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 2,279,361 | 2,271,448
Assets | 5,056 | 4,014
Liabilities | 4,834 | 9,041
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Customer interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 2,122,743 | 2,029,162
Assets | 37,754 | 20,262
Liabilities | 14,260 | 25,880
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Offsetting upstream interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 2,122,743 | 2,029,162
Assets | 7,232 | 8,154
Liabilities | 6,731 | 9,153
Debt Hedging | Hedging Instruments And Hedged Items | Interest Rate Swap |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 900,000 | 900,000
Assets |  | 127
Liabilities | 448 | 6
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 | (10,828) | (15,094)
Debt Hedging | Hedging Instruments And Hedged Items | Term Borrowings, Unamortized Premium (Discount) and Issuance Costs |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | (1,891) | (2,295)
Debt Hedging | Hedging Instruments And Hedged Items | Term Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term borrowings | $ 887,281 | $ 882,611

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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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