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Loans Loans (Summary of Change in Accretable Yield PCI Loans) (Details) - Purchased Impaired Loans [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Summary of Change in Accretable Yield PCI Loans [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield $ 708 $ 245 $ 745 $ 290
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion (37) (31)    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference 0 0    
Certain Loans Acquired in Transfer Not Accounting for as Debt Securities Accretable Yield Other Changes, Net $ 0 $ (14)