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Accumulated Other Comprehensive Income (Reclassifications out of other comprehensive income) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest rate contract $ 1,866,000 $ 1,875,000 $ 488,000
Gain On Sale Of Investments 8,274,000 0 6,896,000
Residual tax effect from OIB's change in applicable tax rate AFS 0 5,000 104,000
Tax effect from changes in tax rates (37,000) (235,000) (284,000)
Total $ 10,103,000 $ 1,645,000 $ 7,204,000