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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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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

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Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading).

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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