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Accumulated Other Comprehensive Income (Reclassifications Out of Other Comprehensive Income) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest-rate contract $ 476,000 $ 549,000 $ 1,525,000 $ 1,325,000
Gain On Sale Of Investments 0 3,498,000 4,728,000 8,274,000
Tax effect from changes in tax rates 1,000 (10,000) 1,000 (38,000)
Total $ 477,000 $ 4,037,000 $ 6,254,000 $ 9,561,000