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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment office	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) investment
Accounting Policies [Abstract]
Number of offices in which the company operates throughout the country | office			25
Maturity of interest bearing deposits			90 days
Evaluation period to return past due loans to accrual status			6 months
Balance of loans serviced for others	$ 326,461		$ 326,461		$ 317,793
Accounting Policies [Line Items]
Mortgage servicing rights	2,671		2,671		2,672
Foreclosed real estate	$ 719		$ 719		$ 710
Percentage of limited partner interest	99.00%		99.00%
Number of investments accounted for under the proportional amortization method | investment					1
Investment in real estate partnership	$ 5,051		$ 5,051		$ 5,450
Investment in real estate partnerships, proportional amortization method	2,045		2,045		2,205
Loss investment in real estate partnership	83	$ 89	261	$ 273
Losses on investments accounted for under the proportional amortization method	52		138
Recognition of federal tax credits	184	119	552	357
Advertising expense	238	$ 244	591	$ 500
Accumulated other comprehensive income, net of taxes	$ 5,136		$ 5,136		$ 1,199
Number of significant operating segment | segment			1
Deposit Premium
Accounting Policies [Line Items]
Finite lives of intangible assets			10 years
Customer Lists
Accounting Policies [Line Items]
Finite lives of intangible assets			15 years
Minimum | Building and Improvements
Accounting Policies [Line Items]
Plant and equipment, useful life			10 years
Minimum | Furniture and Equipment
Accounting Policies [Line Items]
Plant and equipment, useful life			3 years
Maximum | Building and Improvements
Accounting Policies [Line Items]
Plant and equipment, useful life			40 years
Maximum | Furniture and Equipment
Accounting Policies [Line Items]
Plant and equipment, useful life			15 years

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Accounting Policies [Line Items]

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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