Loans Loans (Summary of Change in Accretable Yield PCI Loans (Details) - Purchased Impaired Loans [Member] - HIghland County Bankshares Inc and Subsidiary First and Citizens Bank [Member] - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Oct. 01, 2016
Summary of Change in Accretable Yield PCI Loans [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 290	$ 333
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(20)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	0
Certain Loans Acquired in Transfer Not Accounting for as Debt Securities Accretable Yield Other Changes, Net	$ (23)