Commitments and Contingent Liabilities - Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial instruments with off-balance sheet risk
Contract amount		$ 7,000,000
Commitments to extend credit
Financial instruments with off-balance sheet risk
Contract amount	$ 6,825,318	6,760,395
Standby letters of credit
Financial instruments with off-balance sheet risk
Contract amount	243,965	244,275
Commercial letters of credit
Financial instruments with off-balance sheet risk
Contract amount	$ 6,040	$ 7,299