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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Investments, Debt and Equity Securities [Abstract]  
To state and local governments to secure public deposits, amortized cost $ 283,422
Other securities pledged principally to secure repurchase agreements, amortized cost 552,246
Total pledged securities, amortized cost 835,668
To state and local governments to secure public deposits, fair value 292,225
Other securities pledged principally to secure repurchase agreements, fair value 580,377
Total pledged securities, fair value $ 872,602