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Fair Value Measurement of Assets and Liabilities - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial assets      
Interest bearing deposits with banks $ 1,268,399 $ 1,478,713  
Equity securities 82,774 71,513  
Investment securities held to maturity 3,129,603 3,028,284  
Net loans 8,800 8,800  
Accrued interest receivable 243,897 239,941  
Financial liabilities      
Deposits with stated maturities 11,424,123 12,342,544  
Transfer of loans to loans held for sale, net 23,411 1,042,725 $ 10,000
Nonperforming financial loans      
Financial liabilities      
Transfer of loans to loans held for sale, net 18,000    
U.S. Treasury securities      
Financial assets      
Investment securities held to maturity   25,461  
U.S. government agency securities      
Financial assets      
Investment securities held to maturity 253,062 252,302  
Obligations of states and political subdivisions      
Financial assets      
Investment securities held to maturity 333,834 346,361  
Residential mortgage-backed securities      
Financial assets      
Investment securities held to maturity 2,431,987 2,292,148  
Trust preferred securities      
Financial assets      
Investment securities held to maturity 30,689 29,145  
Corporate and other debt securities      
Financial assets      
Investment securities held to maturity 80,031 82,867  
Carrying Amount      
Financial assets      
Investment securities held to maturity 3,496,571 3,532,220  
Carrying Amount | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial assets      
Cash and due from banks 315,166 411,412  
Interest bearing deposits with banks 1,268,399 1,478,713  
Accrued interest receivable 243,897 239,941  
Financial liabilities      
Deposits without stated maturities 40,758,970 37,733,313  
Accrued interest payable 89,683 150,564  
Carrying Amount | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities      
Financial assets      
Investment securities held to maturity 0 25,480  
Carrying Amount | Significant Other Observable  Inputs (Level 2)      
Financial assets      
Federal Reserve Bank and Federal Home Loan Bank stock 339,484 328,497  
Financial liabilities      
Deposits with stated maturities 11,424,123 12,342,544  
Short-term borrowings 91,475 72,718  
Long-term borrowings 2,908,579 3,174,155  
Junior subordinated debentures issued to capital trusts 57,803 57,455  
Carrying Amount | Significant Other Observable  Inputs (Level 2) | U.S. government agency securities      
Financial assets      
Investment securities held to maturity 292,269 301,315  
Carrying Amount | Significant Other Observable  Inputs (Level 2) | Obligations of states and political subdivisions      
Financial assets      
Investment securities held to maturity 353,875 372,489  
Carrying Amount | Significant Other Observable  Inputs (Level 2) | Residential mortgage-backed securities      
Financial assets      
Investment securities held to maturity 2,732,752 2,710,642  
Carrying Amount | Significant Other Observable  Inputs (Level 2) | Trust preferred securities      
Financial assets      
Investment securities held to maturity 36,103 36,081  
Carrying Amount | Significant Other Observable  Inputs (Level 2) | Corporate and other debt securities      
Financial assets      
Investment securities held to maturity 81,572 86,213  
Carrying Amount | Significant Unobservable Inputs (Level 3)      
Financial assets      
Equity securities 49,371 36,871  
Net loans 49,571,352 48,240,861  
Fair Value      
Financial assets      
Investment securities held to maturity 3,129,603 3,028,284  
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial assets      
Cash and due from banks 315,166 411,412  
Interest bearing deposits with banks 1,268,399 1,478,713  
Accrued interest receivable 243,897 239,941  
Financial liabilities      
Deposits without stated maturities 40,758,970 37,733,313  
Accrued interest payable 89,683 150,564  
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities      
Financial assets      
Investment securities held to maturity 0 25,461  
Fair Value | Significant Other Observable  Inputs (Level 2)      
Financial assets      
Federal Reserve Bank and Federal Home Loan Bank stock 339,484 328,497  
Financial liabilities      
Deposits with stated maturities 11,465,247 12,363,365  
Short-term borrowings 88,468 68,032  
Long-term borrowings 2,916,674 3,109,622  
Junior subordinated debentures issued to capital trusts 53,050 54,957  
Fair Value | Significant Other Observable  Inputs (Level 2) | U.S. government agency securities      
Financial assets      
Investment securities held to maturity 253,062 252,302  
Fair Value | Significant Other Observable  Inputs (Level 2) | Obligations of states and political subdivisions      
Financial assets      
Investment securities held to maturity 333,834 346,361  
Fair Value | Significant Other Observable  Inputs (Level 2) | Residential mortgage-backed securities      
Financial assets      
Investment securities held to maturity 2,431,987 2,292,148  
Fair Value | Significant Other Observable  Inputs (Level 2) | Trust preferred securities      
Financial assets      
Investment securities held to maturity 30,689 29,145  
Fair Value | Significant Other Observable  Inputs (Level 2) | Corporate and other debt securities      
Financial assets      
Investment securities held to maturity 80,031 82,867  
Fair Value | Significant Unobservable Inputs (Level 3)      
Financial assets      
Equity securities 49,371 36,871  
Net loans $ 47,868,967 $ 46,634,654