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Loans Composition (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 30,607,605 $ 29,768,586
Commercial and Industrial Sector [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 11,281,964 10,573,741
Commercial Real Estate Owner Occupied Portfolio [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,101,501 1,143,741
Commercial And Business Lending [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 12,383,465 11,717,483
Commercial Real Estate Investor Portfolio Segment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,370,422 5,227,975
Construction Loans [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,950,267 1,982,632
Commercial Real Estate Portfolio Segment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 7,320,689 7,210,607
Commercial Portfolio Segment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 19,704,154 18,928,090
Residential Mortgage [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 6,949,387 7,047,541
Automobile Loan [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,969,495 2,810,220
Home Equity Line of Credit [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 676,208 664,252
Other Consumer [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 308,361 318,483
Consumer Portfolio Segment [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 10,903,451 $ 10,840,496