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Investment Securities (Investment Securities Pledged To Secure Borrowings And Public Deposits) (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Investments, Debt and Equity Securities [Abstract]  
To state and local governments to secure public deposits, amortized cost $ 1,047,739
Other securities pledged principally to secure repurchase agreements, amortized cost 429,303
Total pledged securities, amortized cost 1,477,042
To state and local governments to secure public deposits, fair value 1,053,644
Other securities pledged principally to secure repurchase agreements, fair value 431,883
Total pledged securities, fair value $ 1,485,527