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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Investments, Debt and Equity Securities [Abstract]  
To state and local governments to secure public deposits, amortized cost $ 275,686
Other securities pledged principally to secure repurchase agreements, amortized cost 604,045
Total pledged securities, amortized cost 879,731
To state and local governments to secure public deposits, fair value 286,052
Other securities pledged principally to secure repurchase agreements, fair value 643,522
Total pledged securities, fair value $ 929,574