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Accumulated Other Comprehensive Income (Reclassifications out of other comprehensive income) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Residual tax effect from OIB's change in applicable tax rate AFS $ 1,000 $ 9,000 $ 103,000 $ 24,000
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest Rate Contract 108,000 664,000 385,000 3,468,000
Tax effect from increase in capital gains tax rate, Cash flow hedges 0 51,000 0 300,000
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income     0 0
Residual tax effect from OIB's change in applicable tax rate AFS 1,000 9,000 104,000 24,000
Tax effect from increase in capital gains tax rate AFS (71,000) (72,000) (216,000) (220,000)
Total $ 38,000 $ 652,000 $ 273,000 $ 3,572,000