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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ (127,723) | $ (49,066)
Notional Amount | 13,589,356 | 5,911,385
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (163,424) | (84,855)
Notional Amount | 6,929,494 | 2,953,724
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 35,701 | 35,789
Notional Amount | 6,659,862 | 2,957,661
Interest rate agreements | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (97,235) | (36,416)
Notional Amount | 2,314,300 | 1,742,000
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | (51,530) | (34,492)
Notional Amount | 139,500 | 139,500
Interest rate agreements | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 17,095 | 28,211
Notional Amount | 1,399,000 | 2,106,500
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 6,610,000 | 1,460,000
TBAs | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (13,359) | (13,215)
Notional Amount | 4,160,000 | 935,000
TBAs | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 5,755 | 4,665
Notional Amount | 2,445,000 | 520,000
Interest rate futures |  |
Derivative [Line Items] |  |
Notional Amount | 226,000 |
Interest rate futures | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (10) | 0
Notional Amount | 12,300 | 0
Interest rate futures | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 777 | 0
Notional Amount | 213,700 | 0
Swaptions | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 1,925 | 0
Notional Amount | 1,065,000 | 0
Loan purchase and interest rate lock commitments | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (1,290) | (732)
Notional Amount | 303,394 | 137,224
Loan purchase and interest rate lock commitments | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 10,149 | 2,913
Notional Amount | $ 1,537,162 | $ 331,161

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