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Accumulated Other Comprehensive Income (Accumulated Comprehensive Income, net of income tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income, net of tax, Total $ 3,348 $ 1,596
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Accumulated other comprehensive income, net of tax, Total 3,348 1,596
AccumulatedOtherThanTemporaryImpairmentMember    
Accumulated Other Comprehensive Income [Line Items]    
Unrealized gain on securities available-for-sale which are not other-than-temporarily impaired 3,485 1,617
Income tax effect of unrealized gain on securities available-for-sale 365 592
Net unrealized gain on securities available for sale wich are not other than temporarily impaired 3,850 2,209
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Unrealized loss on cash flow hedges (822) (1,004)
Income tax effect of unrealized loss on cash flow hedges 320 391
Net unrealized (loss) income on cash flow hedges $ (502) $ (613)