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Commitments and Contingencies (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) shares	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Loan commitments	$ 4,241,000,000	$ 3,720,000,000
Standby letters of credit	65,800,000	86,900,000
Fixed rate loan commitment	3,900,000,000
Floating rate loan commitment	$ 341,300,000
Loan commitments floating rate, minimum	0.00%
Loan commitments floating rate, maximum	14.00%
Allowance for unfunded loan commitments	$ 10,300,000	11,700,000
Extended credit	7,800,000	7,900,000
Credit extensions with collateral	$ 7,400,000	$ 7,500,000
Class B Restricted Shares | Visa
Loss Contingencies [Line Items]
Restricted stock conversion ratio	1.6228
Investment owned, balance, shares | shares	65,466
Investment owned, at cost	$ 0

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- Definition

Amount of valuation allowance recorded for unfunded commitments to extend credit.

+ References

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Amount of credit extended with unaffiliated banks related to letter of credit commitments issued on behalf of our clients.

+ References

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- Definition

Amount of collateral provided to secure credit extended with unaffiliated banks related to letter of credit commitments issued on behalf of our clients.

+ References

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Amount of agreement to extend credit in the form of a loan.

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Maximum floating rate percentage charged on loan commitments.

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Minimum floating rate percentage charged on loan commitments.

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- Definition

Amount of agreement to extend credit in the form of a standby letter of credit.

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Restricted stock conversion ratio.

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Cost of the investment.

+ References

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- Definition

Balance held at close of period in number of shares.

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Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

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