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Derivative Financial Instruments - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) counterparty | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |  |
Notional amount | $ 13,589,356 | $ 5,911,385 |  |
Net unrealized (loss) gain on interest rate agreements |  | 8,908 | $ 1,022 |
Stockholders' equity attributable to parent | $ 1,827,231 | 1,348,794 | 1,212,287 | $ 1,149,428
Number of counterparties | counterparty | 9 |  |  |
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Stockholders' equity attributable to parent | $ (50,939) | (34,045) |  |
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Stockholders' equity attributable to parent |  | (34,045) | (42,953) |
Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 6,929,494 | 2,953,724 |  |
Mortgage Banking Activities, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Changes in fair value of assets | 69,326 | 57,000 | 51,844 |
LPCs, IRLCs, and FSCs | Mortgage Banking Activities, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Changes in fair value of assets | 62,000 | (1,000) | 38,000 |
Interest Rate Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 4,780,000 | 3,850,000 |  |
TBAs |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 6,610,000 | 1,460,000 |  |
TBAs | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 4,160,000 | 935,000 |  |
Interest rate futures |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 226,000 |  |  |
Interest rate futures | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 12,300 | 0 |  |
Residential and Commercial Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Valuation adjustments on derivatives | (134,000) | 40,000 | (31,000) |
Interest rate agreements | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Valuation adjustments on derivatives | (17,000) | 9,000 | $ 1,000 |
Interest rate agreements | Derivative Liabilities |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 2,314,300 | 1,742,000 |  |
Interest rate agreements | Derivative Liabilities | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 139,500 | $ 139,500 |  |

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