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Acquisition of Delaware Bancshares, Inc. (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Jul. 31, 2016
Oct. 31, 2007
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Business Acquisition, Share Price $ 16.68      
Business Acquisition, shares exchanged 431,605,000      
Common Stock, Par or Stated Value Per Share     $ 0.10 $ 0.10
Loans and Leases Receivable, Net Reported Amount     $ 748,254 $ 707,426
Loans Receivable, Fair Value Disclosure     751,637 716,661
Goodwill $ 1,616   11,331 $ 11,331
Finite-Lived Intangible Assets, Gross     449  
Finite-Lived Intangible Assets, Accumulated Amortization     94  
Delaware Bancshares, Inc. Acquisition [Member]        
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Net of Cash Acquired $ 3,860      
Business Acquisition, Share Price $ 16.68      
Business Acquisition, shares exchanged 0.6221      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 431,605      
Credit impaired loans acquired subject to a non-accretable difference $ 1,410      
Non-accretable difference for credit impaired loans acquired $ 260      
Loans and Leases Receivable, Net Reported Amount     111,307  
Loans Receivable, Fair Value Disclosure     109,693  
Goodwill     1,616  
Goodwill, Impairment Loss     $ 0  
Delaware Bancshares, Inc. Acquisition [Member] | Delaware Bancshares, Inc. [Member]        
Business Acquisition [Line Items]        
Proceeds from Issuance of Trust Preferred Securities   $ 8,000    
Delaware Bancshares, Inc. Acquisition [Member] | Delaware Bancshares, Inc. [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Business Acquisition [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     2.40%