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Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Short-Term Debt [Line Items]          
Amount outstanding at period end $ 1,542,981   $ 1,542,981   $ 1,665,061
Federal Funds Purchased [Member]          
Short-Term Debt [Line Items]          
Amount outstanding at period end $ 1,850   $ 1,850   $ 1,850
Weighted-average interest at period end 2.65%   2.65%   0.15%
Average amount outstanding during period $ 28,861 $ 3,283 $ 11,425 $ 4,284  
Maximum amount at any month end during period $ 1,850 $ 4,300 $ 2,350 $ 4,400  
Weighted-average interest rate during period 2.59% 0.23% 2.29% 0.46%  
Securities Sold under Agreements to Repurchase [Member]          
Short-Term Debt [Line Items]          
Amount outstanding at period end $ 541,131   $ 541,131   $ 563,211
Weighted-average interest at period end 0.16%   0.16%   0.05%
Average amount outstanding during period $ 516,546 $ 508,969 $ 542,105 $ 549,315  
Maximum amount at any month end during period $ 541,131 $ 643,403 $ 640,592 $ 643,403  
Weighted-average interest rate during period 0.13% 0.08% 0.09% 0.12%  
FHLB Borrowings [Member]          
Short-Term Debt [Line Items]          
Amount outstanding at period end $ 1,000,000   $ 1,000,000   $ 1,100,000
Weighted-average interest at period end 3.15%   3.15%   0.49%
Average amount outstanding during period $ 405,163 $ 1,100,000 $ 731,982 $ 1,100,000  
Maximum amount at any month end during period $ 1,000,000 $ 1,100,000 $ 1,100,000 $ 1,100,000  
Weighted-average interest rate during period 2.34% 0.49% 0.84% 0.49%