FAIR VALUE MEASUREMENT (Schedule of Assets Measured at Fair Value on Recurring Basis) (Details) - Fair Value Measured on a Recurring Basis [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair value measurement [Line Items]
Fair value of assets	$ 78,901	$ 79,955
Mortgage Servicing Rights [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 13	$ 14
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value measurement [Line Items]
Fair value of assets
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Servicing Rights [Member]
Fair value measurement [Line Items]
Fair value of assets
Significant Other Observable Inputs (Level 2) [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 78,888	$ 79,941
Significant Other Observable Inputs (Level 2) [Member] | Mortgage Servicing Rights [Member]
Fair value measurement [Line Items]
Fair value of assets
Significant Unobservable Inputs (Level 3) [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 13	$ 14
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair value measurement [Line Items]
Fair value of assets	13	14	$ 22
U.S. Agencies Debt Securities [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 22,338	$ 30,433
U.S. Agencies Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value measurement [Line Items]
Fair value of assets
U.S. Agencies Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 22,338	$ 30,433
U.S. Agencies Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurement [Line Items]
Fair value of assets
Mortgage-backed Securities [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 47,284	$ 40,934
Mortgage-backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value measurement [Line Items]
Fair value of assets
Mortgage-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 47,284	$ 40,934
Mortgage-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurement [Line Items]
Fair value of assets
Non-Government Mortgage-backed Securities [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 9,266	$ 8,574
Non-Government Mortgage-backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value measurement [Line Items]
Fair value of assets
Non-Government Mortgage-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value measurement [Line Items]
Fair value of assets	$ 9,266	$ 8,574
Non-Government Mortgage-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurement [Line Items]
Fair value of assets