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ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in the Allowance for Loan and Lease Losses for the Previous Three Years (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]      
Balance at beginning of year $ 49,422 $ 43,149 $ 42,820
Provision for loan and lease losses 8,038 9,322 7,926
Loans charged off (12,712) (6,652) (11,660)
Recoveries 4,124 3,603 4,063
Balance at end of year 48,872 49,422 43,149
Balance at beginning of year, covered 8,539 10,249 10,038
Provision for loan and lease losses - covered (4,456) 818 1,715
Loans charged-off 951 4,462 8,896
Recoveries 2,017 1,934 7,392
Balance at end of year, covered 5,149 8,539 10,249
Balance at beginning of year 57,961 53,398 52,858
Provision for loan and lease losses 3,582 10,140 9,641
Loans charged-off 13,663 11,114 20,556
Recoveries 6,141 5,537 11,455
Balance at end of year $ 54,021 $ 57,961 $ 53,398