Commitments and Contingencies - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Reserve for unfunded commitments		$ 57,200,000	$ 57,500,000
Covered chargebacks, net of reserves			15,300,000
Minimum
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments		0
Maximum
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments		10,000,000
Fair Value, Measurements, Nonrecurring | Level 3 | Qualpay
Loss Contingencies [Line Items]
Qualpay receivable	$ 31,100,000
Fair Value, Measurements, Nonrecurring | Level 3 | Other operating expense | Qualpay
Loss Contingencies [Line Items]
Fair value adjustment	2,700,000
Fair Value, Measurements, Nonrecurring | Level 3 | Non Interest Income | Qualpay
Loss Contingencies [Line Items]
Fair value adjustment	$ 13,100,000
Other Assets
Loss Contingencies [Line Items]
Guarantor obligations, advanced payment to merchant		19,300,000
Guarantee Obligations
Loss Contingencies [Line Items]
Guarantor obligations, monetary amount		114,380,000,000	119,200,000,000
Total letters of credit and unfunded lending commitments		$ 16,253,624,000	$ 17,181,946,000