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Loans - Schedule of Company's Residential Mortgage Loan Portfolio and Commercial Loan Portfolio (Details) - Residential Portfolio Segment - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 8,251,113	$ 6,781,862
Premium (Discount)	117,484	(4,606)
Amortized Cost	8,368,597	6,777,256
Gross Unrealized Gains	111,061	32,389
Gross Unrealized Losses	(280,362)	(391,750)
Fair Value	$ 8,199,296	$ 6,417,895
Weighted Average Coupon	6.32%	5.62%
Weighted Average Yield	6.00%	5.79%
Weighted Average Life (Years)	7 years 3 days	7 years 11 months 4 days
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 194,046	$ 216,547
Premium (Discount)	6,181	1,092
Amortized Cost	200,227	217,639
Gross Unrealized Gains	1,617	3,622
Gross Unrealized Losses	(2,167)	(1,044)
Fair Value	$ 199,677	$ 220,217
Weighted Average Coupon	8.27%	8.54%
Weighted Average Yield	7.22%	8.39%
Weighted Average Life (Years)	4 years 8 months 4 days	4 years 6 months 14 days
Non-Agency Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 36,578	$ 13,098
Premium (Discount)	638	(273)
Amortized Cost	37,216	12,825
Gross Unrealized Gains	18	101
Gross Unrealized Losses	(2,126)	(647)
Fair Value	$ 35,108	$ 12,279
Weighted Average Coupon	6.14%	7.54%
Weighted Average Yield	3.62%	4.72%
Weighted Average Life (Years)	4 years 2 months 1 day	3 years 9 months 3 days
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 135,804	$ 99,863
Premium (Discount)	5,913	1,625
Amortized Cost	141,717	101,488
Gross Unrealized Gains	663	2,509
Gross Unrealized Losses	(41)	(33)
Fair Value	$ 142,339	$ 103,964
Weighted Average Coupon	9.07%	10.35%
Weighted Average Yield	7.77%	9.89%
Weighted Average Life (Years)	4 years 9 months 29 days	4 years 3 months 18 days
Re- and Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 1,140	$ 2,016
Premium (Discount)	(696)	(1,168)
Amortized Cost	444	848
Gross Unrealized Gains	637	981
Gross Unrealized Losses	0	0
Fair Value	$ 1,081	$ 1,829
Weighted Average Yield		103.24%
Weighted Average Life (Years)	1 year 1 month 13 days	1 year 4 months 13 days
Agency-Eligible Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 20,524	$ 101,570
Premium (Discount)	326	908
Amortized Cost	20,850	102,478
Gross Unrealized Gains	299	31
Gross Unrealized Losses	0	(364)
Fair Value	$ 21,149	$ 102,145
Weighted Average Coupon	6.83%	6.89%
Weighted Average Yield	6.34%	6.58%
Weighted Average Life (Years)	4 years 9 months 29 days	4 years 11 months 12 days
Securitized Residential Mortgage Loans | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 8,057,067	$ 6,565,315
Premium (Discount)	111,303	(5,698)
Amortized Cost	8,168,370	6,559,617
Gross Unrealized Gains	109,444	28,767
Gross Unrealized Losses	(278,195)	(390,706)
Fair Value	$ 7,999,619	$ 6,197,678
Weighted Average Coupon	6.27%	5.53%
Weighted Average Yield	5.97%	5.70%
Weighted Average Life (Years)	7 years 25 days	8 years 18 days
Securitized Residential Mortgage Loans | Non-Agency Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 7,026,365	$ 6,382,814
Premium (Discount)	59,755	5,817
Amortized Cost	7,086,120	6,388,631
Gross Unrealized Gains	84,870	28,767
Gross Unrealized Losses	(266,118)	(372,801)
Fair Value	$ 6,904,872	$ 6,044,597
Weighted Average Coupon	5.87%	5.59%
Weighted Average Yield	5.74%	5.68%
Weighted Average Life (Years)	7 years 3 months 18 days	8 years 1 month 13 days
Securitized Residential Mortgage Loans | Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 874,718
Premium (Discount)	61,241
Amortized Cost	935,959
Gross Unrealized Gains	24,574
Gross Unrealized Losses	0
Fair Value	$ 960,533
Weighted Average Coupon	9.81%
Weighted Average Yield	7.70%
Weighted Average Life (Years)	5 years 5 months 4 days
Securitized Residential Mortgage Loans | Re- and Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 155,984	$ 182,501
Premium (Discount)	(9,693)	(11,515)
Amortized Cost	146,291	170,986
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(12,077)	(17,905)
Fair Value	$ 134,214	$ 153,081
Weighted Average Coupon	4.22%	3.43%
Weighted Average Yield	5.93%	6.55%
Weighted Average Life (Years)	5 years 6 months 14 days	5 years 6 months 10 days

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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