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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, 2016
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Assets     $ 1,125,057   $ 750,505
Deposits, total     922,244   550,909
Stockholders' equity     115,700   100,998
Loans and Leases Receivable, Net Reported Amount     700,035   552,627
Loans Receivable, Fair Value Disclosure     715,469   559,416
Goodwill     11,679   $ 9,715
Finite-Lived Intangible Assets, Gross     449    
Finite-Lived Intangible Assets, Accumulated Amortization     14    
Delaware Bancshares, Inc. Acquisition [Member]          
Business Acquisition [Line Items]          
Stockholders' equity $ 19,357        
Payments to Acquire Businesses, Net of Cash Acquired $ 3,859        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 431,605        
Business Acquisition, Share Price $ 16.68        
Business Acquisition, shares exchanged 0.6221        
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, Impairment Loss     0    
Goodwill $ 1,964   $ 1,964    
Delaware Bancshares, Inc. Acquisition [Member] | Delaware Bancshares, Inc. [Member]          
Business Acquisition [Line Items]          
Assets       $ 378,300  
Deposits, total       327,500  
Stockholders' equity       $ 24,100  
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%