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INVESTMENT SECURITIES - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) security | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) security
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Held-to-maturity securities transferred |  |  | $ 740,900,000 |  |  |
Increase to AOCI from transfer |  |  | 22,000,000 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Proceeds from sales of securities available-for-sale |  |  |  | $ 417,870,000 | $ 937,173,000 |
OTTI on investment securities | $ 0 |  | $ 0 | $ 0 | $ 0 |
Securities available for sale portfolio | security | 151 |  |  | 151 |  | 191
Available for sale securities in unrealized loss position | security | 76 |  |  | 76 |  | 33
Collateral Pledged |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Securities pledged | $ 139,800,000 |  |  | $ 139,800,000 |  | $ 564,400,000
Corporate debt securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Proceeds from sales of securities available-for-sale |  | $ 76,800,000 |  |  |  |

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