FAIR VALUE MEASUREMENTS, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014
Financial assets
Securities available for sale	$ 1,202,536us-gaap_AvailableForSaleSecurities	$ 1,140,216us-gaap_AvailableForSaleSecurities
Securities held to maturity	311,999	279,312
Level 1 [Member]
Financial assets
Cash and cash equivalents	24,883	29,832
Securities available for sale	966	825
Securities held to maturity	0	0
Total securities	966	825
Loans receivable:
Total loans receivable	0	0
Federal Home Loan Bank stock	0	0
Accrued interest receivable	12,466	11,222
Financial liabilities
Noninterest bearing demand deposits	1,558,459	1,126,715
Interest bearing demand deposits, savings, and money markets	110,541	105,273
Certificates of deposit	0	0
Total deposits	1,669,001	1,231,988
Advances from Federal Home Loan Bank	0	0
Federal fund purchased		0
Securities sold under agreements to repurchase	0	0
Subordinated debentures	0	0
Accrued interest payable	160	318
Level 2 [Member]
Financial assets
Cash and cash equivalents	0	0
Securities available for sale	1,201,570	1,139,391
Securities held to maturity	311,999	279,312
Total securities	1,513,569	1,418,703
Loans receivable:
Total loans receivable	0	0
Federal Home Loan Bank stock	13,250	21,245
Accrued interest receivable	0	0
Financial liabilities
Noninterest bearing demand deposits	0	0
Interest bearing demand deposits, savings, and money markets	0	0
Certificates of deposit	61,790	134,746
Total deposits	61,790	134,746
Advances from Federal Home Loan Bank	8,741	8,789
Federal fund purchased	261,000	470,000
Securities sold under agreements to repurchase	11,637	10,411
Subordinated debentures	10,413	10,415
Accrued interest payable	0	0
Level 3 [Member]
Financial assets
Cash and cash equivalents	0	0
Securities available for sale	0	0
Securities held to maturity	0	0
Total securities	0	0
Loans receivable:
Total loans receivable	630,251	504,388
Federal Home Loan Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities
Noninterest bearing demand deposits	0	0
Interest bearing demand deposits, savings, and money markets	0	0
Certificates of deposit	0	0
Total deposits	0	0
Advances from Federal Home Loan Bank	0	0
Federal fund purchased		0
Securities sold under agreements to repurchase	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Carrying Amount [Member]
Financial assets
Cash and cash equivalents	24,883	29,832
Securities available for sale	1,202,536	1,140,216
Securities held to maturity	311,062	282,933
Total securities	1,513,598	1,423,149
Loans receivable:
Total loans receivable	624,739	499,201
Federal Home Loan Bank stock	13,250	21,245
Accrued interest receivable	12,466	11,222
Financial liabilities
Noninterest bearing demand deposits	1,558,459	1,126,715
Interest bearing demand deposits, savings, and money markets	110,541	105,273
Certificates of deposit	61,672	134,553
Total deposits	1,730,672	1,366,541
Advances from Federal Home Loan Bank	7,000	7,000
Federal fund purchased	261,000	470,000
Securities sold under agreements to repurchase	11,637	10,411
Subordinated debentures	10,310	10,310
Accrued interest payable	160	318
Estimated Fair Value [Member]
Financial assets
Cash and cash equivalents	24,883	29,832
Securities available for sale	1,202,536	1,140,216
Securities held to maturity	311,999	279,312
Total securities	1,514,535	1,419,528
Loans receivable:
Total loans receivable	630,251	504,388
Federal Home Loan Bank stock	13,250	21,245
Accrued interest receivable	12,466	11,222
Financial liabilities
Noninterest bearing demand deposits	1,558,459	1,126,715
Interest bearing demand deposits, savings, and money markets	110,541	105,273
Certificates of deposit	61,790	134,746
Total deposits	1,730,791	1,366,734
Advances from Federal Home Loan Bank	8,741	8,789
Federal fund purchased	261,000	470,000
Securities sold under agreements to repurchase	11,637	10,411
Subordinated debentures	10,413	10,415
Accrued interest payable	160	318
One to Four Family Residential Mortgage Loans [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0	0
One to Four Family Residential Mortgage Loans [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0	0
One to Four Family Residential Mortgage Loans [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	111,355	111,254
One to Four Family Residential Mortgage Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	115,741	116,395
One to Four Family Residential Mortgage Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	111,355	111,254
Commercial and Multi-family Real Estate Loans [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0	0
Commercial and Multi-family Real Estate Loans [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0	0
Commercial and Multi-family Real Estate Loans [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	270,464	234,845
Commercial and Multi-family Real Estate Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	260,537	224,302
Commercial and Multi-family Real Estate Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	270,464	234,845
Agricultural Real Estate Loans [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0	0
Agricultural Real Estate Loans [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0	0
Agricultural Real Estate Loans [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	66,500	58,651
Agricultural Real Estate Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	65,720	56,071
Agricultural Real Estate Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	66,500	58,651
Consumer Loans [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0	0
Consumer Loans [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0	0
Consumer Loans [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	30,889	29,580
Consumer Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	30,535	29,329
Consumer Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	30,889	29,580
Commercial Operating Loans [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0	0
Commercial Operating Loans [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0	0
Commercial Operating Loans [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	21,746	25,660
Commercial Operating Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	27,266	30,846
Commercial Operating Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	21,746	25,660
Agricultural Operating Loans [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0	0
Agricultural Operating Loans [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0	0
Agricultural Operating Loans [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	43,101	44,398
Agricultural Operating Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	41,749	42,258
Agricultural Operating Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	43,101	44,398
Premium Finance [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0
Premium Finance [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0
Premium Finance [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	86,196
Premium Finance [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	83,191
Premium Finance [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	$ 86,196

The fair value disclosure of accrued interest payable as of the balance sheet date.

No definition available.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents accrued interest receivable as of the balance sheet date.

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Fair value of Federal Home Loan Bank (FHLBank) advances carried under the fair value option.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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