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Securities - Amounts Reclassified From Accumulated Other Comprehensive Income (Details) - Amounts Reclassified from Accumulated Other Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Loss realized in earnings $ (8) $ (8)
Total reclassified amount before tax (8) (8)
Tax benefit (3) (3)
Total reclassifications out of accumulated other comprehensive loss $ (5) $ (5)