Fair Value - Unfunded Loan and Lease Commitments and Letters of Credit (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Unfunded loan and lease commitments and letters of credit
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit	$ 7,000,000	$ 6,700,000
Level 3
Unfunded loan and lease commitments and letters of credit
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit	7,000,000	6,700,000
Estimated fair value of unfunded loan and lease commitments and letters of credit	$ 44,200	$ 44,300