COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) commitment	Oct. 14, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 case	Sep. 30, 2015 company	Sep. 30, 2015 court
Commitments and Contingencies Disclosure [Abstract]
Unfunded loan commitments			$ 182,900,000		$ 158,300,000
Commitment to purchase securities					0
Number of commitment to purchase securities, available for sale | commitment			2
Purchase commitment amount, available for sale			$ 7,900,000
Number of commitment to purchase securities, held to maturity | commitment			3
Purchase commitment amount, held to maturity			$ 3,000,000
Securities pledged as collateral for public funds on deposit			5,800,000		5,800,000
Securities pledged as collateral for individual, trust, and estate deposits			3,400,000		$ 14,800,000
Loss Contingencies [Line Items]
Number of identified limited liability companies | company							3
Loss Contingency, Damages Awarded, Value			$ 6,100,000
Number of class action litigations | case						4
Number of federal district courts							3	3
Litigation Settlement, Amount		$ 74,000
Inter National Bank [Member]
Loss Contingencies [Line Items]
Amount of shortfall in depository account	$ 10,500,000
UniRush, LLC [Member]
Loss Contingencies [Line Items]
Period of inability of customers of prepaid card product to access product			14 days
Subsequent Event [Member] | Card Limited, LLC v. MetaBank dba Meta Payment Systems [Member]
Loss Contingencies [Line Items]
Estimate of possible loss				$ 1,579,398