INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Federal:
Current	$ 4,410	$ 4,217	$ 3,787
Deferred	(440)	(3,896)	(1,765)
Federal income tax expense	3,970	321	2,022
State:
Current	1,422	1,048	874
Deferred	210	(1)	10
State tax expense	1,632	1,047	884
Income tax expense	5,602	1,368	2,906
Income tax expense (benefit) to statutory federal income tax rate reconciliation [Abstract]
Income tax expense at federal tax rate	13,588	6,798	6,517
Increase (decrease) resulting from:
State income taxes net of federal benefit	933	692	575
Nontaxable buildup in cash surrender value	(580)	(711)	(399)
Incentive stock option expense	(66)	(37)	(187)
Tax exempt income	(8,257)	(5,230)	(3,594)
Nondeductible expenses	196	188	120
Other, net	(212)	(332)	(126)
Income tax expense	5,602	1,368	2,906
Deferred tax assets:
Bad debts	2,044	2,286
Deferred compensation	1,345	1,040
Stock based compensation	165	235
Operational reserve	540	453
AMT Credit	5,563	4,490
Intangibles	393	573
Indirect tax benefits of unrecognized tax positions	216	384
Other assets	1,462	1,293
Gross deferred tax assets	11,728	10,754
Deferred tax liabilities:
FHLB stock dividend	(411)	(414)
Premises and equipment	(1,913)	(1,222)
Patents	(988)	(967)
Prepaid expenses	(668)	(633)
Net unrealized gains on securities available for sale	(12,348)	(521)
Gross deferred tax liabilities	(16,328)	(3,757)
Net deferred tax liabilities	(4,600)
Net deferred tax assets		6,997
Gross deferred tax on state net operating loss carryforwards	921	829
Additional bad debt deductions provided by federal income tax laws	6,700
Deferred tax liability, bad debt deductions	2,300	2,300
Reconciliation for liabilities [Abstract]
Balance at beginning of year	974	983
Additions for tax positions related to the current year	63	49
Additions for tax positions related to the prior years	0	4
Reductions for tax positions due to settlement with taxing authorities	(372)	(62)
Reductions for tax positions related to prior years	(140)	0
Balance at end of year	525	$ 974	$ 983
Unrecognized tax benefits that, if recognized, would impact the effective rate	347
Accrued interest related to unrecognized tax benefits	110
Deferred Tax Expense, Event of Liquidation	$ 2,300