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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Held to maturity securities $ 2,051,628 $ 2,132,882
Loans held for sale 36,477 33,158
Derivative financial instruments, Financial assets 44,299 46,120
Derivative financial instruments, Financial liabilities 31,619 36,259
Total Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 779,230 695,261
Available for sale securities 5,976,386 5,961,917
Held to maturity securities 1,926,729 2,011,026
Loans, net 23,577,647 23,588,681
Loans held for sale 63,090 33,158
Derivative financial instruments, Financial assets 55,683 63,126
Deposits 29,072,945 29,274,190
Federal funds purchased 325 70,400
Securities sold under agreements to repurchase 660,126 546,892
Short-term FHLB Borrowings 700,215 400,000
Long-term debt 155,330 162,257
Derivative financial instruments, Financial liabilities 91,143 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 779,018 695,032
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 212 229
Available for sale securities 5,976,386 5,961,917
Held to maturity securities 1,926,729 2,011,026
Loans held for sale 63,090 33,158
Derivative financial instruments, Financial assets 55,683 63,126
Federal funds purchased 325 70,400
Securities sold under agreements to repurchase 660,126 546,892
Short-term FHLB Borrowings 700,215 400,000
Long-term debt 155,330 162,257
Derivative financial instruments, Financial liabilities 90,061 94,083
Total Fair Value [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Loans, net 23,577,647 23,588,681
Deposits 29,072,945 29,274,190
Derivative financial instruments, Financial liabilities 1,082 1,284
Carrying Amount [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 779,230 695,261
Available for sale securities 5,976,386 5,961,917
Held to maturity securities 2,051,628 2,132,882
Loans, net 23,680,524 23,650,709
Loans held for sale 63,090 33,158
Derivative financial instruments, Financial assets 55,683 63,126
Deposits 29,082,134 29,279,774
Federal funds purchased 325 70,400
Securities sold under agreements to repurchase 660,126 546,892
Short-term FHLB Borrowings 700,000 400,000
Long-term debt 193,785 199,407
Derivative financial instruments, Financial liabilities $ 91,143 $ 95,367