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Business Combinations (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 15, 2017
Jul. 31, 2017
Jun. 01, 2016
Aug. 11, 2017
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Goodwill         $ 38,201 $ 38,201
Monitor Bancorp, Inc.            
Business Acquisition [Line Items]            
Business Acquisition, Effective Date of Acquisition Aug. 15, 2017          
Shares of stock issued for acquisition 465,787          
Fair value of total consideration transferred $ 7,512          
Maximum shares exchanged for stock 85.00%          
Maximum shares exchanged for cash 15.00%          
Cash consideration per share $ 769.38          
Multiplier used to calculate per share cash consideration 1.25          
Period of trading days considered for volume weighted average closing price       20 days    
Volume weighted average closing price per share of common shares $ 14.04          
Final stock exchange ratio 54.80          
Goodwill $ 1,037          
Monitor Bancorp, Inc. | Core Deposits            
Business Acquisition [Line Items]            
Fair value of other intangible assets $ 673          
Bowers Insurance Agency, Inc.            
Business Acquisition [Line Items]            
Business Acquisition, Effective Date of Acquisition         Jun. 01, 2016  
Shares of stock issued for acquisition     123,280      
Fair value of total consideration transferred     $ 3,155      
Goodwill     1,849      
Fair value of other intangible assets     1,630      
Contingent future payments     1,200      
Contingent consideration   $ 316 $ 880      
Contingent consideration future payment liability           200
Reduction to acquisition related costs           $ 364
Bowers Insurance Agency, Inc. | Earnout Payment            
Business Acquisition [Line Items]            
Contingent consideration   $ 564