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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended
May 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
subsidary
$ / shares
Dec. 31, 2016
$ / shares
Subsequent Event [Line Items]      
Par value (in dollars per share) | $ / shares   $ 1.00 $ 1.00
Subsequent Event      
Subsequent Event [Line Items]      
Par value (in dollars per share) | $ / shares $ 1.00    
Repayment of other debt $ 19,900    
Repayment of subordinated debentures 5,000    
Contribution to subsidiary $ 15,000    
Subsequent Event | IPO      
Subsequent Event [Line Items]      
Initial public offering common stock issued (in shares) | shares 2,300,000    
Purchase price (in dollars per share) | $ / shares $ 27.00    
Gross proceeds from initial public offering $ 62,100    
Net proceeds from initial public offering $ 57,600    
The Bank      
Subsequent Event [Line Items]      
Number of wholly-owned non-bank subsidiaries | subsidary   5