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Commitments and Contingent Liabilities - Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial instruments with off-balance sheet risk    
Contract amount $ 6,300,000 $ 6,000,000
Commitments to extend credit    
Financial instruments with off-balance sheet risk    
Contract amount 6,021,693 5,789,600
Standby letters of credit    
Financial instruments with off-balance sheet risk    
Contract amount 243,356 230,379
Commercial letters of credit    
Financial instruments with off-balance sheet risk    
Contract amount $ 837 $ 6,460