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BASIS OF PRESENTATION (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
BASIS OF PRESENTATION              
Allowance for credit losses   $ 43,401 $ 39,215 $ 32,786 $ 31,171 $ 31,784 $ 31,418
Adjustment to retained earnings   $ 159,635   150,703      
ASU 2016-13 | Impact of adoption              
BASIS OF PRESENTATION              
Allowance for credit losses $ 1,600     $ 1,625      
Reserve for unfunded commitments 500            
Cumulative effect on retained earnings 1,500            
Adjustment to retained earnings $ 0