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Borrowings - Narrative (Details) - USD ($) $ in Thousands					12 Months Ended
	Sep. 11, 2025	Dec. 30, 2024	Oct. 30, 2020	Mar. 25, 2019	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 16, 2019	Sep. 17, 2003
Debt Instrument [Line Items]
Market value pledged to repurchase agreements					$ 625,300	$ 358,400
Repaid outstanding balance					499,000	132,550	$ 16,752
Total senior and subordinated debt					744,718	899,071
Gains (losses) on debt extinguishment					9,767	$ 0	$ 698
Senior Notes Due 2029 | Senior Notes
Debt Instrument [Line Items]
Notes and subordinated debt				$ 300,000
Debt instrument, stated interest rate, percentage				4.10%
Senior Notes Due 2029 | Senior Notes | US Treasury (UST) Interest Rate
Debt Instrument [Line Items]
Basis spread				0.25%
2029 subordinated notes | Sterling
Debt Instrument [Line Items]
Aggregate principal amount								$ 274,000
Fixed-to-floating rate								4.00%
Interest rate on notes						6.84%
2029 subordinated notes | Subordinated Debt
Debt Instrument [Line Items]
Repaid outstanding balance					274,000
Total senior and subordinated debt					0	$ 274,000
Gains (losses) on debt extinguishment					3,600
2029 subordinated notes | Subordinated Debt | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread		2.53%
2030 subordinated notes | Sterling
Debt Instrument [Line Items]
Aggregate principal amount			$ 225,000
Fixed-to-floating rate			3.875%
2030 subordinated notes | Subordinated Debt
Debt Instrument [Line Items]
Repaid outstanding balance					225,000
Total senior and subordinated debt					0	225,000
Gains (losses) on debt extinguishment					6,200
2030 subordinated notes | Subordinated Debt | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread			3.69%
2035 subordinated notes | Subordinated Debt
Debt Instrument [Line Items]
Notes and subordinated debt	$ 350,000
Debt instrument, stated interest rate, percentage	5.784%
Total senior and subordinated debt					$ 350,000	$ 0
Fixed-Rate Subordinated Notes Due 2035 | Subordinated Debt
Debt Instrument [Line Items]
Basis spread	2.125%
Maturity	5 years
Redemption price percentage	100.00%
2033 Junior Subordinated Notes | 2033 junior subordinated notes
Debt Instrument [Line Items]
Notes and subordinated debt									$ 77,300
2033 Junior Subordinated Notes | 2033 junior subordinated notes | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate on notes					6.92%	7.56%
Interest rate spread of LIBOR plus (as a percent)									2.95%

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