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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       $ 49,333       $ 40,444 $ 49,333 $ 40,444  
Loans and leases charged off                 (18,499) (5,581) $ (2,618)
Recoveries of loans and leases previously charged off                 1,143 771 2,258
Provision for loan and lease losses $ 6,653 $ 1,410 $ 2,653 $ 19,499 $ 5,052 $ 3,561 $ 2,503 $ 2,583 30,215 13,699 5,271
Balance at end of year $ 62,192       $ 49,333       $ 62,192 $ 49,333 $ 40,444