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Derivatives - Derivatives Associated With Cash Flow Hedges (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2017 | Mar. 31, 2016
Interest Rate Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional | $ 800,000 | $ 800,000 |  |  |
Cash Flow Hedge | Hedging Instruments And Hedged Items |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional |  |  |  | $ 650,000 |
Variability in cash flows related to debt instruments (primarily loans) |  |  |  |  | $ 250,000
Cash Flow Hedge | Hedging Instruments And Hedged Items | Interest Rate Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Variability in cash flows related to debt instruments (primarily loans) | 1,500,000 | 1,500,000 | $ 900,000 |  |
Cash Flow Hedge | Hedging Instruments And Hedged Items | Interest Rate Swap |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional | 1,500,000 | 1,500,000 | 900,000 |  |
Assets | 35,606 | 35,606 |  |  |
Liabilities |  |  | $ 241 |  |
Mortgage Banking Hedges | Hedging Instruments And Hedged Items | Interest Rate Lock |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional | 698,744 | 698,744 |  |  |
Assets | 21,677 | 21,677 |  |  |
Liabilities | 223 | 223 |  |  |
Gain (loss) on derivative instruments | 7,434 | 7,434 |  |  |
Mortgage Banking Hedges | Hedging Instruments And Hedged Items | Forward Sales Contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notional | 753,660 | 753,660 |  |  |
Assets | 859 | 859 |  |  |
Liabilities | 2,577 | 2,577 |  |  |
Gain (loss) on derivative instruments | $ (9,633) | $ (9,633) |  |  |

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