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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       $ 62,192       $ 49,333 $ 62,192 $ 49,333 $ 40,444
Loans and leases charged off                 (41,766) (18,499) (5,581)
Recoveries of loans and leases previously charged off                 836 1,143 771
Net charge-offs                 (40,930) (17,356) (4,810)
Provision for loan losses $ (2,678) $ 38,540 $ (1,987) $ 2,512 $ 6,653 $ 1,410 $ 2,653 $ 19,499 36,387 30,215 13,699
Balance at end of year $ 57,649       $ 62,192       $ 57,649 $ 62,192 $ 49,333