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Accumulated Other Comprehensive Income (Reclassifications out of other comprehensive income) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Other Than Temporary Impairment on securities $ (1,490,000) $ 0 $ 0
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest Rate Contract 6,443,000 6,572,000 6,053,000,000
Tax effect from increase in capital gains tax rate, Cash flow hedges (297,000) 773,000 0
Other Than Temporary Impairment on securities (1,490,000) 0 0
Residual tax effect from OIB's change in applicable tax rate AFS 45,000 170,000 148,000,000
Tax effect from increase in capital gains tax rate AFS 516,000 (45,000) 0
Total $ 5,217,000 $ 7,470,000 $ 6,201,000,000