FAIR VALUE ACCOUNTING (Assets Measured on a Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Assets Measured on a Recurring Basis
Estimated Fair Value	$ 119,702	$ 95,883
U.S. government agency obligations
Assets Measured on a Recurring Basis
Estimated Fair Value	35,986	18,041
Mortgage-backed securities
Assets Measured on a Recurring Basis
Estimated Fair Value	43,463	36,474
Agency Securities
Assets Measured on a Recurring Basis
Estimated Fair Value	223	230
Corporate debt securities
Assets Measured on a Recurring Basis
Estimated Fair Value	5,052	5,343
Fair Value, Measurements, Recurring
Assets Measured on a Recurring Basis
Estimated Fair Value	119,702	95,883
Fair Value, Measurements, Recurring | U.S. government agency obligations
Assets Measured on a Recurring Basis
Estimated Fair Value	35,986	18,041
Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
Assets Measured on a Recurring Basis
Estimated Fair Value	34,978	35,795
Fair Value, Measurements, Recurring | Mortgage-backed securities
Assets Measured on a Recurring Basis
Estimated Fair Value	43,463	36,474
Fair Value, Measurements, Recurring | Agency Securities
Assets Measured on a Recurring Basis
Estimated Fair Value	223	230
Fair Value, Measurements, Recurring | Corporate debt securities
Assets Measured on a Recurring Basis
Estimated Fair Value	5,052	5,343
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1)
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | U.S. government agency obligations
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Obligations of states and political subdivisions
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Mortgage-backed securities
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Agency Securities
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Corporate debt securities
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets Measured on a Recurring Basis
Estimated Fair Value	119,702	95,883
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency obligations
Assets Measured on a Recurring Basis
Estimated Fair Value	35,986	18,041
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets Measured on a Recurring Basis
Estimated Fair Value	34,978	35,795
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets Measured on a Recurring Basis
Estimated Fair Value	43,463	36,474
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency Securities
Assets Measured on a Recurring Basis
Estimated Fair Value	223	230
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Assets Measured on a Recurring Basis
Estimated Fair Value	5,052	5,343
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency obligations
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Agency Securities
Assets Measured on a Recurring Basis
Estimated Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Assets Measured on a Recurring Basis
Estimated Fair Value	$ 0	$ 0