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Accumulated Other Comprehensive Income (Reclassifications out of other comprehensive income) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Residual tax effect from OIB's change in applicable tax rate AFS $ 95,000 $ 8,000 $ 103,000 $ 16,000
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest Rate Contract 128,000 1,354,000 277,000 2,804,000
Tax effect from increase in capital gains tax rate, Cash flow hedges 0 120,000 0 249,000
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income 0 0 0 (2,557,000)
Residual tax effect from OIB's change in applicable tax rate AFS 95,000 8,000 103,000 16,000
Tax effect from increase in capital gains tax rate AFS (71,000) (72,000) (145,000) (146,000)
Total $ 152,000 $ 1,410,000 $ 235,000 $ 5,480,000