Commitments and Contingent Liabilities - Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial instruments with off-balance sheet risk
Contract amount	$ 6,100,000	$ 6,000,000
Commitments to extend credit
Financial instruments with off-balance sheet risk
Contract amount	5,892,249	5,789,600
Standby letters of credit
Financial instruments with off-balance sheet risk
Contract amount	236,919	230,379
Commercial letters of credit
Financial instruments with off-balance sheet risk
Contract amount	$ 6,056	$ 6,460