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Loans and Leases Held for Investment at Amortized Cost, Net of Allowance for Loan and Lease Losses - Gross Charge-Offs by Origination Year (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Term Loans and Leases by Origination Year
Year 1			$ 7,823
Year 2			108,503
Year 3			74,244
Year 4			0
Year 5			318
Prior			122
Total	$ 74,178	$ 23,728	191,010	$ 48,669
Consumer Portfolio Segment
Term Loans and Leases by Origination Year
Year 1			7,823
Year 2			108,503
Year 3			72,875
Year 4			0
Year 5			0
Prior			0
Total	73,644	22,944	189,201	46,668
Consumer Portfolio Segment \| Unsecured personal
Term Loans and Leases by Origination Year
Year 1			7,730
Year 2			106,835
Year 3			72,330
Year 4			0
Year 5			0
Prior			0
Total			186,895
Consumer Portfolio Segment \| Residential mortgages
Term Loans and Leases by Origination Year
Year 1			0
Year 2			0
Year 3			0
Year 4			0
Year 5			0
Prior			0
Total			0
Consumer Portfolio Segment \| Secured consumer
Term Loans and Leases by Origination Year
Year 1			93
Year 2			1,668
Year 3			545
Year 4			0
Year 5			0
Prior			0
Total			2,306
Commercial Portfolio Segment
Term Loans and Leases by Origination Year
Year 1			0
Year 2			0
Year 3			1,369
Year 4			0
Year 5			318
Prior			122
Total	$ 534	$ 784	1,809	$ 2,001
Commercial Portfolio Segment \| Equipment finance
Term Loans and Leases by Origination Year
Year 1			0
Year 2			0
Year 3			0
Year 4			0
Year 5			0
Prior			0
Total			0
Commercial Portfolio Segment \| Commercial real estate
Term Loans and Leases by Origination Year
Year 1			0
Year 2			0
Year 3			0
Year 4			0
Year 5			0
Prior			0
Total			0
Commercial Portfolio Segment \| Commercial and industrial
Term Loans and Leases by Origination Year
Year 1			0
Year 2			0
Year 3			1,369
Year 4			0
Year 5			318
Prior			122
Total			$ 1,809