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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Held to maturity securities $ 2,435,663 $ 2,132,882
Loans held for sale 18,929 33,158
Derivative financial instruments, Financial assets $ 71,893 46,120
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag false  
Derivative financial instruments, Financial liabilities $ 54,707 36,259
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag false  
Total Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold $ 1,514,625 695,261
Available for sale securities 5,161,491 5,961,917
Held to maturity securities 2,233,526 2,011,026
Loans, net 22,562,577 23,588,681
Loans held for sale 21,525 33,158
Derivative financial instruments, Financial assets 73,840 63,126
Deposits 29,482,628 29,274,190
Federal funds purchased 300 70,400
Securities sold under agreements to repurchase 638,715 546,892
Short-term FHLB Borrowings   400,000
Long-term debt 174,660 162,257
Derivative financial instruments, Financial liabilities 160,623 95,367
Total Fair Value [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 1,514,216 695,032
Total Fair Value [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 409 229
Available for sale securities 5,161,491 5,961,917
Held to maturity securities 2,233,526 2,011,026
Loans held for sale 21,525 33,158
Derivative financial instruments, Financial assets 73,840 63,126
Federal funds purchased 300 70,400
Securities sold under agreements to repurchase 638,715 546,892
Short-term FHLB Borrowings   400,000
Long-term debt 174,660 162,257
Derivative financial instruments, Financial liabilities 158,534 94,083
Total Fair Value [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Loans, net 22,562,577 23,588,681
Deposits 29,482,628 29,274,190
Derivative financial instruments, Financial liabilities 2,089 1,284
Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 1,514,625 695,261
Available for sale securities 5,161,491 5,961,917
Held to maturity securities 2,435,663 2,132,882
Loans, net 22,980,565 23,650,709
Loans held for sale 21,525 33,158
Derivative financial instruments, Financial assets 73,840 63,126
Deposits 29,492,851 29,279,774
Federal funds purchased 300 70,400
Securities sold under agreements to repurchase 638,715 546,892
Short-term FHLB Borrowings   400,000
Long-term debt 210,544 199,407
Derivative financial instruments, Financial liabilities $ 160,623 $ 95,367