Commitments and Contingencies (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Allowance for loan losses	$ 471,238,000	$ 407,837,000	$ 471,238,000	$ 407,837,000	$ 457,010,000	$ 443,424,000	$ 414,956,000	$ 427,597,000
Covered chargebacks, net of reserves						15,300,000
Minimum
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	0		0
Maximum
Loss Contingencies [Line Items]
Total letters of credit and unfunded lending commitments	5,000,000		5,000,000
Fair Value, Measurements, Nonrecurring Basis | Qualpay receivable | Other Operating Income (Expense)
Loss Contingencies [Line Items]
Assets, fair value adjustment			2,700,000
Fair Value, Measurements, Nonrecurring Basis | Qualpay receivable | Non-Interest Income
Loss Contingencies [Line Items]
Assets, fair value adjustment			13,100,000
Fair Value, Measurements, Nonrecurring Basis | Level 3
Loss Contingencies [Line Items]
Qualpay receivable	31,100,000		31,100,000
Guarantee obligations
Loss Contingencies [Line Items]
Maximum potential exposure for sponsored transactions	29,390,000,000	$ 31,000,000,000	59,500,000,000	$ 59,600,000,000
Total letters of credit and unfunded lending commitments	16,772,795,000		16,772,795,000			17,181,946,000
Unfunded Loan Commitment
Loss Contingencies [Line Items]
Allowance for loan losses	$ 55,700,000		$ 55,700,000			$ 57,500,000