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Loans - Schedule of Loans and Leases Held for Investment at Amortized Cost (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	$ 3,186,145		$ 4,272,812
Allowance for loan and lease losses	(192,893)	$ (237,697)	(275,743)	$ (252,989)	$ (244,193)	$ (236,734)
Loans and leases held for investment at amortized cost, net	2,993,252		3,997,069
Accrued interest	13,400		17,900
Consumer
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	2,545,252		3,603,548
Allowance for loan and lease losses	(176,727)	(221,196)	(258,811)	(237,433)	(227,608)	(212,598)
Consumer \| Unsecured consumer
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	2,207,014		3,191,430
Consumer \| Residential mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	147,460		151,073
Consumer \| Secured consumer
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	190,778		261,045
Commercial
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	640,893		669,264
Allowance for loan and lease losses	(16,166)	$ (16,501)	(16,932)	$ (15,556)	$ (16,585)	$ (24,136)
Commercial \| Equipment finance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	33,249		39,757
Commercial \| Commercial real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	460,203		472,489
Commercial \| Commercial real estate \| Office
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	35,000		35,000
Commercial \| Commercial real estate \| Small Business Association loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	279,600		286,800
Commercial \| Commercial and industrial
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment at amortized cost	$ 147,441		$ 157,018