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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) branch segment	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 investment
Accounting Policies [Abstract]
Number of branches in which the company operates throughout the country | branch	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	$ 326,838		$ 328,701
Finite-Lived Intangible Assets [Line Items]
Mortgage servicing rights	2,791		2,835
Foreclosed real estate	$ 1,019		346
Percentage of limited partner interest	99.00%
Number of investments accounted for under the proportional amortization method | investment				1
Investment in real estate partnership	$ 4,768		4,909
Investment in real estate partnerships, proportional amortization method	1,940		1,993
Loss investment in real estate partnership	89	$ 89
Losses on investments accounted for under the proportional amortization method	53		$ 33
Recognition of federal tax credits	253	184
Advertising expense	$ 103	$ 151
Number of significant operating segments | segment	1
Building and Improvements | Maximum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life	40 years
Building and Improvements | Minimum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life	10 years
Furniture and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life	15 years
Furniture and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life	3 years
Deposit Premium
Finite-Lived Intangible Assets [Line Items]
Finite lives of intangible assets	10 years
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite lives of intangible assets	15 years

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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