ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Portfolios (Parenthetical) (Detail) - USD ($) $ in Thousands |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
---|---|---|---|---|---|---|
Financing Receivable Allowance For Credit Losses [Line Items] | ||||||
Loans and Leases Receivable, Gross | $ 9,113,955 | $ 8,858,123 | $ 8,640,291 | |||
PCI loans | ||||||
Financing Receivable Allowance For Credit Losses [Line Items] | ||||||
Loans and Leases Receivable, Gross | $ 141,706 | $ 144,443 | $ 146,640 | $ 152,242 | $ 155,281 | $ 158,174 |