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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Investments, Debt and Equity Securities [Abstract]  
To state and local government to secure public deposits, amortized cost $ 1,673,773
To secure repurchased agreements, amortized cost 624,279
Other securities pledged, amortized cost 2,543,803
Total pledged securities, amortized cost 4,841,855
To state and local governments to secure public deposits, fair value 1,515,229
To secure repurchase agreements, fair value 557,728
Other securities pledged, fair value 2,318,996
Total pledged securities, fair value $ 4,391,953