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INVESTMENT SECURITIES - Additional Information (Detail)	3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($) security	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) security	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity securities transferred | $		$ 740,900,000
Increase to AOCI from transfer | $		$ 22,000,000
Securities available for sale, pledged | $	$ 719,000,000			$ 719,000,000		$ 581,800,000
OTTI on investment securities | $	$ 0		$ 0	$ 0	$ 0
Securities available for sale portfolio | security	205			205		161
Available for sale securities in unrealized loss position | security	44			44		59
Securities held to maturity portfolio | security						87
Held to maturity securities in unrealized loss position | security						15

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- Definition

Number of available for sale securities in portfolio.

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Number Of Held To Maturity Securities In Portfolio

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
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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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-Section 50
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Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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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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