LOANS RECEIVABLE, NET - Summary of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 1,326,832	$ 925,894
Less:
Allowance for Loan Losses	(7,534)	(5,635)
Net Deferred Loan Origination Fees	(1,461)	(789)
Total Loans Receivable, Net	1,317,837	919,470
1-4 Family Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	196,706	162,298
Commercial and Multi-Family Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	585,510	422,932
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	61,800	63,612
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	163,004	37,094
Commercial Operating [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	35,759	31,271
Agricultural Operating [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	33,594	37,083
Premium Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 250,459	$ 171,604