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Derivatives - Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities (Details) - Hedging Instruments And Hedged Items - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Customer Interest Rate Contracts Hedging | Customer interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) related to interest rate derivatives | $ 29,112 | $ (24,724)
Customer Interest Rate Contracts Hedging | Offsetting upstream interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) related to interest rate derivatives | (29,112) | 24,724
Debt Hedging | Interest Rate Swap |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) related to interest rate derivatives | 4,279 | (6,595)
Debt Hedging | Term Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains/(Losses) related to term borrowings | $ (4,266) | $ 6,550

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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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