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Accumulated Other Comprehensive Income (Reclassifications out of other comprehensive income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income $ 0 $ 1,490 $ 0
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest Rate Contract 3,642 6,443 6,572
Tax effect from increase in capital gains tax rate, Cash flow hedges 300 (297) 773
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income 0 1,490 0
Residual tax effect from OIB's change in applicable tax rate AFS 32 45 170
Tax effect from increase in capital gains tax rate AFS (293) 516 (45)
Total $ 3,681 $ 5,217 $ 7,470