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Acquisitions - Additional Information (Details) - Pacific Rim Bank - USD ($)
9 Months Ended
Jun. 16, 2015
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]      
Acquisition date   Jun. 16, 2015  
Shares of common stock issued in exchange for acquisition 621,345    
Stock value per share, acquisition date $ 19.00    
Cash paid upon acquisition to dissenting shareholders $ 543,000    
Goodwill 1,300,000    
Deferred income tax asset, operating loss carry-forward   $ 1,800,000  
Increase in net income, pro forma adjustment   200,000 $ 33,000
Business combination, pro forma information, revenue of acquiree since acquisition date, actual   1,600,000  
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual   $ 500,000  
Core deposit      
Business Acquisition [Line Items]      
Business combination, value of deposit $ 1,100,000    
Finite-lived intangible asset, amortized period   7 years