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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 15, 2016
Aug. 15, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jun. 30, 2006
Aug. 26, 1999
Feb. 12, 1996
Related Party Transaction [Line Items]                    
Unfunded commitments     $ 1,000   $ 1,000   $ 69,000      
Deposits from related parties     138,140,000   138,140,000   68,612,000      
Aviation Time Sharing Agreement                    
Related Party Transaction [Line Items]                    
Payments to related party     267,000 $ 27,000 299,000 $ 48,000        
Initial Public Offering                    
Related Party Transaction [Line Items]                    
Repayments of subordinated debt $ 10,075,000 $ 10,075,000                
Certain Executive Officers and Directors and Their Associates                    
Related Party Transaction [Line Items]                    
Unfunded commitments     4,014,000   4,014,000   7,212,000      
Shareholders                    
Related Party Transaction [Line Items]                    
Unamortized leasehold improvements     164,000   164,000   180,000      
Lease expense     128,000 $ 76,000 392,000 327,000        
Paid for management consulting services           $ 230,000        
Ownership percentage held by shareholder       100.00%   100.00%        
Subordinated debt               $ 6,000,000 $ 3,300,000 $ 775,000
Payment of interest     106,000 $ 48,000 230,000 $ 131,000        
Director                    
Related Party Transaction [Line Items]                    
Amount of investment held by the company     $ 1,145,000   1,145,000   $ 1,472,000      
Capital distributions received         $ 0 $ 0