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Other Investment Securities (Schedule Of Other Investment Securities) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Investments [Line Items]          
Federal Home Loan Bank Stock $ 35,280,000   $ 35,280,000   $ 43,388,000
Federal Reserve Bank Stock 10,811,000   10,811,000   8,225,000
Equity investments carried at fair value 1,832,000   1,832,000   1,649,000
Equity Method Investments 2,689,000   2,689,000   2,589,000
Alternative Investment 16,718,000   16,718,000   17,065,000
Other investment securities 67,330,000   67,330,000   72,916,000
Gain on equity securities, net 232,000 $ 1,348,000 1,974,000 $ 4,544,000  
Alternative Investment, income recognized 170,000 1,000,000.0 1,800,000 752,000  
Equity Securities, FV-NI, Unrealized Gain       (3,500,000)  
Equity Securities [Member]          
Schedule of Investments [Line Items]          
Gain on equity securities, net 62,000 $ 304,000      
Investments [Member]          
Schedule of Investments [Line Items]          
Gain on equity securities, net     183,000 $ 293,000  
Fair Value Measured at Net Asset Value Per Share [Member]          
Schedule of Investments [Line Items]          
Alternative Investment $ 12,400,000   $ 12,400,000   $ 11,000,000.0