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SECURITIES AVAILABLE FOR SALE - Additional Information (Detail) $ in Thousands	2 Months Ended	12 Months Ended
	Mar. 04, 2016 USD ($)	Dec. 31, 2015 USD ($) security	Dec. 31, 2014 USD ($) security	Dec. 31, 2013 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Securities held | security		53	37
Sales of available for sale securities		$ 65,611	$ 169,573	$ 74,273
Gross gains on the sales of securities		1,948	2,301	473
Gross losses on securities available for sale		24	366	$ 141
Fair value of securities pledged to secure public funds and other purposes		250,397	$ 261,034
Debt security		392,229
Fair value of debt securities		$ 394,051
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Securities held | security		21
Securities held, less than 12 months category | security		16
Securities held, 12 months or longer category | security		5	16
Private label CMOs
Schedule of Available-for-sale Securities [Line Items]
Securities held | security		3
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt security		$ 392,229	$ 373,725
Fair value of debt securities		$ 394,051	$ 376,132
Debt Securities | US Government Agencies and US Government Sponsored Enterprises (GSE)
Schedule of Available-for-sale Securities [Line Items]
Securities held | security		29	21
Securities held, less than 12 months category | security		25	13
Securities held, 12 months or longer category | security		4	8
Debt Securities | States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Debt security		$ 124,421	$ 52,578
Fair value of debt securities		$ 125,961	52,401
Debt Securities | Private label CMOs
Schedule of Available-for-sale Securities [Line Items]
Securities held, less than 12 months category | security		3
Debt security		$ 8,944
Fair value of debt securities		8,901
Debt Securities | GSE commercial CMOs
Schedule of Available-for-sale Securities [Line Items]
Debt security		63,598	65,041
Fair value of debt securities		$ 63,770	$ 65,472
Debt Securities | GSE commercial CMOs | Subsequent Event
Schedule of Available-for-sale Securities [Line Items]
Net gain on sale of investments (unaudited)	$ 1,420

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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

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The difference between the carrying value and the sale price of debt securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale.

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