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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Investments, Debt and Equity Securities [Abstract]  
To state and local governments to secure public deposits, amortized cost $ 260,684
Other securities pledged principally to secure repurchase agreements, amortized cost 569,733
Total pledged securities, amortized cost 830,417
To state and local governments to secure public deposits, fair value 271,661
Other securities pledged principally to secure repurchase agreements, fair value 605,466
Total pledged securities, fair value $ 877,127