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Stock-Based Compensation (Detail Textuals)
$ in Millions
6 Months Ended
Feb. 20, 2018
shares
Jun. 30, 2018
USD ($)
Plan
shares
Jun. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based payment award shares issued (shares) | shares   43,550  
Employee Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of share options exercised | $   $ 0.3  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation expenses | $   0.6 $ 0.4
Unrecognized stock compensation expense for restricted stock | $   $ 2.6  
Weighted average period for recognition of compensation expense for restricted stock   1 year 9 months 18 days  
Restricted Stock | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of grant as share quantity for which performance metric is met 0.00%    
Restricted Stock | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of grant as share quantity for which performance metric is met 200.00%    
BNC Financial Group Inc Stock Option 2012 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of equity award plans | Plan   3  
Number of common stock reserved for issuance (shares) | shares   587,630  
BNC Financial Group Inc Stock Option 2012 Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based payment award shares issued (shares) | shares 11,250    
Share based payment award, vesting period 3 years