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Segment Information - Statements of Income (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 1,331,219 | $ 948,401 | $ 466,087
Interest expense | 903,228 | 557,617 | 212,005
Net interest income | 427,991 | 390,784 | 254,082
Other revenue: |  |  |
Gain on sales, including fee-based services, net | 72,522 | 55,816 | 123,037
Mortgage servicing rights | 69,912 | 69,346 | 130,230
Servicing revenue | 193,542 | 152,068 | 133,429
Amortization of MSRs | (63,093) | (59,876) | (58,615)
Property operating income | 5,708 | 1,877 | 185
Gain (loss) on derivative instruments, net | 6,763 | 26,609 | (2,684)
Other income (loss), net | 7,667 | (17,563) | 7,566
Total other revenue | 293,021 | 228,277 | 333,148
Other expenses: |  |  |
Employee compensation and benefits | 159,788 | 161,825 | 171,796
Selling and administrative | 51,260 | 53,990 | 45,575
Property operating expenses | 5,897 | 2,136 | 718
Depreciation and amortization | 9,743 | 8,732 | 7,215
Provision for loss sharing (net of recoveries) | 15,695 | 1,862 | (6,167)
Provision for credit losses (net of recoveries) | 73,446 | 21,169 | (21,113)
Litigation settlement |  | 7,350 |
Total other expenses | 315,829 | 257,064 | 198,024
Income before extinguishment of debt, gain on real estate, income from equity affiliates and income taxes | 405,183 | 361,997 | 389,206
Loss on extinguishment of debt | (1,561) | (4,933) | (3,374)
Gain on sale of real estate | 0 | 0 | 3,693
Income from equity affiliates | 24,281 | 14,247 | 34,567
Provision for income taxes | (27,347) | (17,484) | (46,285)
Net income | 400,556 | 353,827 | 377,807
Preferred stock dividends | 41,369 | 40,954 | 21,888
Net income attributable to noncontrolling interest | 29,122 | 28,044 | 38,507
Net income attributable to common stockholders | $ 330,065 | 284,829 | 317,412
Reporting segments | segment | 2 |  |
Operating segments | Structured Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 1,279,433 | 903,622 | 427,039
Interest expense | 880,602 | 538,659 | 194,435
Net interest income | 398,831 | 364,963 | 232,604
Other revenue: |  |  |
Gain on sales, including fee-based services, net | 0 | 0 | 0
Mortgage servicing rights | 0 | 0 | 0
Servicing revenue | 0 | 0 | 0
Amortization of MSRs | 0 | 0 | 0
Property operating income | 5,708 | 1,877 | 185
Gain (loss) on derivative instruments, net | 0 | 0 | 0
Other income (loss), net | 4,868 | (2,360) | 7,491
Total other revenue | 10,576 | (483) | 7,676
Other expenses: |  |  |
Employee compensation and benefits | 53,507 | 56,032 | 51,225
Selling and administrative | 23,234 | 26,059 | 21,064
Property operating expenses | 5,897 | 2,136 | 718
Depreciation and amortization | 5,052 | 4,041 | 2,524
Provision for loss sharing (net of recoveries) | 0 | 0 | 0
Provision for credit losses (net of recoveries) | 70,344 | 19,770 | (21,223)
Litigation settlement |  | 7,350 |
Total other expenses | 158,034 | 115,388 | 54,308
Income before extinguishment of debt, gain on real estate, income from equity affiliates and income taxes | 251,373 | 249,092 | 185,972
Loss on extinguishment of debt | (1,561) | (4,933) | (3,374)
Gain on sale of real estate |  |  | 2,466
Income from equity affiliates | 24,281 | 14,247 | 34,567
Provision for income taxes | 803 | (821) | (5,940)
Net income | 274,896 | 257,585 | 213,691
Preferred stock dividends | 41,369 | 40,954 | 21,888
Net income attributable to noncontrolling interest | 0 | 0 | 0
Net income attributable to common stockholders | 233,527 | 216,631 | 191,803
Operating segments | Agency Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 51,786 | 44,779 | 39,048
Interest expense | 22,626 | 18,958 | 17,570
Net interest income | 29,160 | 25,821 | 21,478
Other revenue: |  |  |
Gain on sales, including fee-based services, net | 72,522 | 55,816 | 123,037
Mortgage servicing rights | 69,912 | 69,346 | 130,230
Servicing revenue | 193,542 | 152,068 | 133,429
Amortization of MSRs | (63,093) | (59,876) | (58,615)
Property operating income | 0 | 0 | 0
Gain (loss) on derivative instruments, net | 6,763 | 26,609 | (2,684)
Other income (loss), net | 2,799 | (15,203) | 75
Total other revenue | 282,445 | 228,760 | 325,472
Other expenses: |  |  |
Employee compensation and benefits | 106,281 | 105,793 | 120,571
Selling and administrative | 28,026 | 27,931 | 24,511
Property operating expenses | 0 | 0 | 0
Depreciation and amortization | 4,691 | 4,691 | 4,691
Provision for loss sharing (net of recoveries) | 15,695 | 1,862 | (6,167)
Provision for credit losses (net of recoveries) | 3,102 | 1,399 | 110
Litigation settlement |  | 0 |
Total other expenses | 157,795 | 141,676 | 143,716
Income before extinguishment of debt, gain on real estate, income from equity affiliates and income taxes | 153,810 | 112,905 | 203,234
Loss on extinguishment of debt | 0 | 0 | 0
Gain on sale of real estate |  |  | 1,227
Income from equity affiliates | 0 | 0 | 0
Provision for income taxes | (28,150) | (16,663) | (40,345)
Net income | 125,660 | 96,242 | 164,116
Preferred stock dividends | 0 | 0 | 0
Net income attributable to noncontrolling interest | 0 | 0 | 0
Net income attributable to common stockholders | 125,660 | 96,242 | 164,116
Other |  |  |
Other expenses: |  |  |
Net income attributable to noncontrolling interest | 29,122 | 28,044 | 38,507
Net income attributable to common stockholders | $ (29,122) | $ (28,044) | $ (38,507)

X
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit), extinguishment of debt, sale of real estate and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References No definition available. + Details
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- Definition The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + Details
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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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