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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]          
Balance at beginning of period $ 54,763 $ 49,333 $ 42,736 $ 49,333 $ 40,444
Loans and leases charged off (950)   (2,898) (15,589) (3,255)
Recoveries of loans and leases previously charged off 212   44 782 110
Provision for loan and lease losses 2,653   2,503 22,152 5,086
Balance at end of period $ 56,678 $ 54,763 $ 42,385 $ 56,678 $ 42,385