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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]            
Balance at beginning of period $ 63,885 $ 62,192 $ 54,763 $ 49,333 $ 62,192 $ 49,333
Loans charged off (2,451)   (950)   (3,514) (15,589)
Recoveries of loans and leases previously charged off 76   212   320 782
Net charge-offs (2,375)   (738)   (3,194) (14,807)
(Reversal of) provision for loan losses (1,987) 2,512 2,653   525 22,152
Balance at end of period $ 59,523 $ 63,885 $ 56,678 $ 54,763 $ 59,523 $ 56,678