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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 23,150,000 | $ 37,166,000
Notional Amount | 6,861,921,000 | 11,346,407,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (3,317,000) | (16,072,000)
Notional Amount | 1,619,790,000 | 3,582,153,000
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 26,467,000 | 53,238,000
Notional Amount | 5,242,131,000 | 7,764,254,000
Interest rate agreements | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (1,251,000) | 0
Notional Amount | 283,100,000 | 0
Interest rate agreements | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 611,000 | 224,000
Notional Amount | 161,500,000 | 42,000,000
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 3,310,000,000 | 6,630,000,000
TBAs | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (658,000) | (15,495,000)
Notional Amount | 870,000,000 | 3,105,000,000
TBAs | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 2,880,000 | 18,260,000
Notional Amount | 2,440,000,000 | 3,520,000,000
Futures |  |
Derivative [Line Items] |  |
Notional Amount | 72,000,000 |
Futures | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (905,000) | 0
Notional Amount | 62,500,000 | 0
Futures | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 25,000 | 0
Notional Amount | 9,000,000 | 0
Swaptions | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 18,318,000 | 19,727,000
Notional Amount | 1,660,000,000 | 1,585,000,000
Loan purchase and interest rate lock commitments | Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (503,000) | (577,000)
Notional Amount | 404,190,000 | 477,153,000
Loan purchase and interest rate lock commitments | Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 4,633,000 | 15,027,000
Notional Amount | $ 971,631,000 | $ 2,617,254,000

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