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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
Investments, Debt and Equity Securities [Abstract]  
To state and local governments to secure public deposits, amortized cost $ 296,883
Other securities pledged principally to secure repurchase agreements, amortized cost 630,343
Total pledged securities, amortized cost 927,226
To state and local governments to secure public deposits, fair value 307,204
Other securities pledged principally to secure repurchase agreements, fair value 669,759
Total pledged securities, fair value $ 976,963