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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
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest Rate Contract | $ 1,875 | $ 488 | $ 3,642
Tax effect from increase in capital gains tax rate, Cash flow hedges | 0 | 0 | 300
Gain On Sale Of Investments | 0 | 6,896 | 12,207
Residual tax effect from OIB's change in applicable tax rate AFS | 5 | 104 | 32
Tax effect from increase in capital gains tax rate AFS | (235) | (284) | (293)
Total | $ 1,645 | $ 7,204 | $ 15,888

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