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Related Party Transactions - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 15, 2016
Aug. 15, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jun. 30, 2006
Aug. 26, 1999
Feb. 12, 1996
Related Party Transaction [Line Items]                    
Unfunded commitments     $ 1   $ 1   $ 1      
Deposits from related parties     139,448   139,448   150,373      
Aviation Time Sharing Agreement                    
Related Party Transaction [Line Items]                    
Payments to related party     2 $ 14 27 $ 32        
Initial Public Offering                    
Related Party Transaction [Line Items]                    
Repayments of subordinated debt $ 10,075 $ 10,075                
Certain Executive Officers and Directors and Their Associates                    
Related Party Transaction [Line Items]                    
Unfunded commitments     5,720   5,720   6,838      
Shareholders                    
Related Party Transaction [Line Items]                    
Unamortized leasehold improvements     148   148   158      
Lease expense     124 130 250 264        
Subordinated debt               $ 6,000 $ 3,300 $ 775
Payment of interest       $ 56   $ 124        
Director                    
Related Party Transaction [Line Items]                    
Amount of investment held by the company     $ 1,145   $ 1,145   $ 1,145