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Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Short-term Debt [Line Items]    
Amount outstanding at period end $ 1,017,292,000 $ 639,015,000
Federal Funds Purchased [Member]    
Short-term Debt [Line Items]    
Amount outstanding at period end 70,400,000 300,000
Average amount outstanding during period 16,879,000 12,935,000
Maximum amount at any month end during period $ 110,300,000 $ 200,275,000
Weighted-average interest rate at period end 3.74% 3.90%
Weighted-average interest rate during period 4.84% 5.61%
Securities Sold Under Agreements to Repurchase [Member]    
Short-term Debt [Line Items]    
Amount outstanding at period end $ 546,892,000 $ 638,715,000
Average amount outstanding during period 613,630,000 639,912,000
Maximum amount at any month end during period $ 734,288,000 $ 792,589,000
Weighted-average interest rate at period end 1.18% 0.95%
Weighted-average interest rate during period 1.36% 1.65%
FHLB Borrowings [Member]    
Short-term Debt [Line Items]    
Amount outstanding at period end $ 400,000,000 $ 0
Average amount outstanding during period 339,044,000 238,593,000
Maximum amount at any month end during period $ 1,275,000,000 $ 650,000,000
Weighted-average interest rate at period end 3.62% 0.00%
Weighted-average interest rate during period 4.28% 5.48%