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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 37,166,000 | $ (127,723,000)
Notional Amount | 11,346,407,000 | 13,589,356,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (16,072,000) | (163,424,000)
Notional Amount | 3,582,153,000 | 6,929,494,000
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 53,238,000 | 35,701,000
Notional Amount | 7,764,254,000 | 6,659,862,000
Interest rate agreements | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | 0 | (97,235,000)
Notional Amount | 0 | 2,314,300,000
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Fair Value | 0 | (51,530,000)
Notional Amount | 0 | 139,500,000
Interest rate agreements | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 224,000 | 17,095,000
Notional Amount | 42,000,000 | 1,399,000,000
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 6,630,000,000 | 6,610,000,000
TBAs | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (15,495,000) | (13,359,000)
Notional Amount | 3,105,000,000 | 4,160,000,000
TBAs | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 18,260,000 | 5,755,000
Notional Amount | 3,520,000,000 | 2,445,000,000
Futures |  |
Derivative [Line Items] |  |
Notional Amount |  | 226,000,000
Futures | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | 0 | (10,000)
Notional Amount | 0 | 12,300,000
Futures | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 0 | 777,000
Notional Amount | 0 | 213,700,000
Swaptions | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 19,727,000 | 1,925,000
Notional Amount | 1,585,000,000 | 1,065,000,000
Loan purchase and interest rate lock commitments | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (577,000) | (1,290,000)
Notional Amount | 477,153,000 | 303,394,000
Loan purchase and interest rate lock commitments | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 15,027,000 | 10,149,000
Notional Amount | $ 2,617,254,000 | $ 1,537,162,000

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