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Acquisition of Delaware Bancshares, Inc. (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jul. 31, 2016
Oct. 31, 2007
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Certain Loans Acquired in Transfer, Nonaccretable Difference $ 1,014        
Loans and Leases Receivable, Net Reported Amount     $ 707,426 $ 552,627  
Loans Receivable, Fair Value Disclosure     716,661 559,416  
Goodwill     11,331 9,715  
Goodwill, Impairment Loss     0 0 $ 0
Finite-Lived Intangible Assets, Accumulated Amortization     732 $ 610  
Delaware Bancshares, Inc. Acquisition [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Share Price $ 16.68        
Business Acquisition, shares exchanged 0.6221        
Payments to Acquire Businesses, Gross $ 3,860        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 431,605        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance $ 1,410        
Certain Loans Acquired in Transfer, Nonaccretable Difference 260        
Loans and Leases Receivable, Net Reported Amount 111,307        
Loans Receivable, Fair Value Disclosure 109,693        
Goodwill $ 1,616   1,616    
Goodwill, Impairment Loss     $ 0    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years    
Finite-Lived Intangible Assets, Gross     $ 449    
Finite-Lived Intangible Assets, Accumulated Amortization     $ 14    
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%