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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
banking_office
Jan. 01, 2019
USD ($)
Accounting Policies [Abstract]      
Number of banking offices | banking_office   32  
Change in Accounting Estimate [Line Items]      
Restructuring (reversal) costs incurred $ (158) $ 2,600  
ROU assets 24,118 24,118  
Operating lease liabilities $ 25,457 $ 25,457  
ASU 2016-02      
Change in Accounting Estimate [Line Items]      
ROU assets     $ 23,300
Adjustment to remove deferred rent liability     1,400
Operating lease liabilities     $ 24,700