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INVESTMENT SECURITIES - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) security	Jun. 30, 2017 USD ($)	Mar. 31, 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
Schedule of Available-for-sale Securities [Line Items]
Securities sold	$ 190,917,000		$ 378,539,000
Securities available for sale, pledged	571,400,000			$ 564,400,000
OTTI on investment securities	$ 0		$ 0
Securities available for sale portfolio | security	177			191
Available for sale securities in unrealized loss position | security	56			33
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Securities sold	$ 76,800,000

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Number of available for sale securities in portfolio.

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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-Publisher FASB
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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale).

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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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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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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