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Derivative Financial Instruments - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |
Notional amount |  | $ 11,346,407,000 | $ 13,589,356,000 |  |
Stockholders' equity attributable to parent |  | 1,110,899,000 | 1,827,231,000 | $ 1,348,794,000 | $ 1,212,287,000
Interest Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Expected amortization of realized losses related to terminated cash flow hedges |  | 4,000,000 |  |  |
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stockholders' equity attributable to parent |  | (80,557,000) | (50,939,000) | (34,045,000) |
Mortgage Banking Activities, Net |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Changes in fair value of assets |  | 66,482,000 | 69,326,000 | 57,000,000 |
LPCs, IRLCs, and FSCs | Mortgage Banking Activities, Net |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Changes in fair value of assets |  | 57,000,000 | 62,000,000 | (1,000,000) |
Interest Rate Contract |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 1,630,000,000 | 4,780,000,000 |  |
TBAs |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  | 6,630,000,000 | 6,610,000,000 |  |
Futures |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  |  | 226,000,000 |  |
Residential and Commercial Loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Valuation adjustments on derivatives |  | (93,000,000) | (134,000,000) | 40,000,000 |
Interest rate agreements | Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Valuation adjustments on derivatives |  | $ (33,000,000) | $ (17,000,000) | $ 9,000,000 |
Derivative payment | $ 84,000,000 |  |  |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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