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INVESTMENT SECURITIES - Additional Information (Details)		3 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($)
Debt Securities, Available-for-sale [Line Items]
Held-to maturity securities transferred	$ 740,900,000
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale			$ 22,000,000
Proceeds from sales of securities available-for-sale				$ 417,870,000	$ 981,481,000	$ 4,096,453,000
Other than temporary impairment losses				$ 3,252,000	$ 0	$ 0
Securities available-for-sale portfolio | security				145	191
Securities in unrealized loss position | security				118	33
Collateral
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, pledged				$ 163,000,000	$ 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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