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Fair Value, Company's Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | $ 15,314 |  | $ 30,048 |  |  |
Servicing related assets | [1] | 218,688 |  | 233,658 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 3,866 |  | 3,869 |  |  |
Interest Rate Swaps [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 15,314 |  | 17,244 |  |  |
TBAs [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 0 |  | 10,434 |  |  |
U.S. Treasury Futures [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 0 |  | 2,337 |  |  |
U.S. Treasury Futures Options [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 33 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 0 |  | 2,370 |  |  |
Servicing related assets |  | 0 |  | 0 |  |  |
Total Assets |  | 0 |  | 2,370 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 1,673 |  | 0 |  |  |
Total Liabilities |  | 1,673 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 15,314 |  | 27,678 |  |  |
Servicing related assets |  | 0 |  | 0 |  |  |
Total Assets |  | 1,206,792 |  | 1,150,098 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 2,193 |  | 3,869 |  |  |
Total Liabilities |  | 2,193 |  | 3,869 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 0 |  | 0 |  |  |
Servicing related assets |  | 218,688 | $ 224,601 | 233,658 | $ 226,782 | $ 234,263 | $ 253,629
Total Assets |  | 218,688 |  | 233,658 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 0 |  | 0 |  |  |
Total Liabilities |  | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 0 |  | 0 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 15,314 |  | 17,244 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 1,638 |  | 3,869 |  |  |
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 0 |  | 0 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 0 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 0 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 10,434 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 555 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | TBAs [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 0 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 0 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 2,337 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 1,673 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 0 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 0 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures [Member] | Level 3 [Member] |  |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 0 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures Options [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 33 |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures Options [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Futures Options [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 15,314 |  | 30,048 |  |  |
Servicing related assets |  | 218,688 |  | 233,658 |  |  |
Total Assets |  | 1,425,480 |  | 1,386,126 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 3,866 |  | 3,869 |  |  |
Total Liabilities |  | 3,866 |  | 3,869 |  |  |
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  | 15,314 |  | 17,244 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 1,638 |  | 3,869 |  |  |
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | TBAs [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 10,434 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | 555 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | U.S. Treasury Futures [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | 2,337 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivative liabilities total |  | $ 1,673 |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | U.S. Treasury Futures Options [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivative assets total |  |  |  | $ 33 |  |  |
RMBS [Member] | Level 2 [Member] |  |  |  |  |  |  |
Derivative Instruments Classified as Fair Value Assets and Liabilities [Abstract] |  |  |  |  |  |  |
Percentage of derivative instruments classified as fair value assets and liabilities |  | 100.00% |  | 100.00% |  |  |
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | $ 0 |  | $ 0 |  |  |
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 1,191,478 |  | 1,122,420 |  |  |
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 0 |  | 0 |  |  |
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 1,191,478 |  | 1,122,420 |  |  |
Fannie Mae [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 0 |  | 0 |  |  |
Fannie Mae [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 509,839 |  | 425,599 |  |  |
Fannie Mae [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 0 |  | 0 |  |  |
Fannie Mae [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 509,839 |  | 425,599 |  |  |
Freddie Mac [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 0 |  | 0 |  |  |
Freddie Mac [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 681,639 |  | 696,821 |  |  |
Freddie Mac [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | 0 |  | 0 |  |  |
Freddie Mac [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
RMBS total |  | $ 681,639 |  | $ 696,821 |  |  |
MSRs [Member] | Level 3 [Member] |  |  |  |  |  |  |
Derivative Instruments Classified as Fair Value Assets and Liabilities [Abstract] |  |  |  |  |  |  |
Percentage of derivative instruments classified as fair value assets and liabilities |  | 100.00% |  | 100.00% |  |  |
Derivative Instruments [Member] | Level 2 [Member] |  |  |  |  |  |  |
Derivative Instruments Classified as Fair Value Assets and Liabilities [Abstract] |  |  |  |  |  |  |
Percentage of derivative instruments classified as fair value assets and liabilities |  | 100.00% |  | 100.00% |  |  |
[1] | See Note 9 regarding the estimation of fair value, which approximates carrying value for all pools.

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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