Commitments and Contingent Liabilities - Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial instruments with off-balance sheet risk
Contract amount	$ 6,500,000	$ 7,000,000	$ 6,700,000
Commitments to extend credit
Financial instruments with off-balance sheet risk
Contract amount	6,308,343	6,760,395
Standby letters of credit
Financial instruments with off-balance sheet risk
Contract amount	234,102	244,275
Commercial letters of credit
Financial instruments with off-balance sheet risk
Contract amount	$ 3,629	$ 7,299