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Accumulated Other Comprehensive Income (Reclassifications out of other comprehensive income) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Accumulated other comprehensive income, net of tax | $ (8,047) |  |  | $ (10,963)
ASU 2017-12 [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Accumulated other comprehensive income, net of tax |  |  | $ 14,400 |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest Rate Contract | 217 | $ 374 |  |
Residual tax effect from OIB's change in applicable tax rate AFS | 0 | 5 |  |
Tax effect from increase in capital gains tax rate AFS | (17) | (65) |  |
Total | $ 200 | $ 314 |  |

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