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Accumulated Other Comprehensive Income (Reclassifications Out of Other Comprehensive Income) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest-rate contract $ 1,988 $ 1,866 $ 1,875
Gain On Sale Of Investments 4,728 8,274 0
Residual tax effect from OIB's change in applicable tax rate AFS 0 0 5
Tax effect from changes in tax rates 2 (37) (235)
Total $ 6,718 $ 10,103 $ 1,645