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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 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 costs incurred $ 2,800  
ROU assets 24,519  
Operating lease liabilities $ 25,893  
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