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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of year       $ 40,444       $ 35,533 $ 40,444 $ 35,533 $ 29,480
Loans and leases charged off                 (5,581) (2,618) (1,942)
Recoveries of loans and leases previously charged off                 771 2,258 526
Provision for loan and lease losses $ 5,052 $ 3,561 $ 2,503 $ 2,583 $ 589 $ 2,592 $ 1,769 $ 321 13,699 5,271 7,469
Balance at end of year $ 49,333       $ 40,444       $ 49,333 $ 40,444 $ 35,533