ACCOUNTING FOR CERTAIN LOANS ACQUIRED IN A TRANSFER - Carrying amount of loans included in balance sheet of loans receivable (Details) - Loans Receivable - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	$ 1,387	$ 1,873
Construction/Land
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	56	411
One-to-four family residential
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	$ 918	$ 1,035
Multi-family residential
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans
Commercial
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	$ 13	$ 14
Dupont State Bank
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	1,920	2,703
Fair value adjustment for credit-impaired loans	(533)	(830)
Carrying balance of acquired credit-impaired loans	1,387	1,873
Dupont State Bank | Construction/Land
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	131	682
Dupont State Bank | One-to-four family residential
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	$ 1,209	$ 1,400
Dupont State Bank | Multi-family residential
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans
Dupont State Bank | Nonresidential real estate and agricultural land
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	$ 538	$ 568
Dupont State Bank | Commercial
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	22	24
Dupont State Bank | Consumer and other
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	$ 20	$ 29