FAIR VALUE MEASUREMENTS, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Financial assets
Securities available for sale	$ 1,048,457us-gaap_AvailableForSaleSecurities	$ 1,140,216us-gaap_AvailableForSaleSecurities
Securities held to maturity	302,549	279,312
Level 1 [Member]
Financial assets
Cash and cash equivalents	52,470	29,832
Securities available for sale	853	825
Securities held to maturity	0	0
Total securities	853	825
Loans receivable:
Total loans receivable	0	0
Federal Home Loan Bank stock	0	0
Accrued interest receivable	12,397	11,222
Financial liabilities
Noninterest bearing demand deposits	1,586,382	1,126,715
Interest bearing demand deposits, savings, and money markets	102,094	105,273
Certificates of deposit	0	0
Total deposits	1,688,476	1,231,988
Advances from Federal Home Loan Bank	0	0
Securities sold under agreements to repurchase	0	0
Subordinated debentures	0	0
Accrued interest payable	255	318
Level 2 [Member]
Financial assets
Cash and cash equivalents	0	0
Securities available for sale	1,047,604	1,139,391
Securities held to maturity	302,549	279,312
Total securities	1,350,153	1,418,703
Loans receivable:
Total loans receivable	0	0
Federal Home Loan Bank stock	5,685	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	100,481	134,746
Total deposits	100,481	134,746
Advances from Federal Home Loan Bank	8,746	8,789
Federal fund purchased	81,000	470,000
Securities sold under agreements to repurchase	14,221	10,411
Subordinated debentures	10,414	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	594,187	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	52,470	29,832
Securities available for sale	1,048,457	1,140,216
Securities held to maturity	303,315	282,933
Total securities	1,351,772	1,423,149
Loans receivable:
Total loans receivable	596,322	499,201
Federal Home Loan Bank stock	5,685	21,245
Accrued interest receivable	12,397	11,222
Financial liabilities
Noninterest bearing demand deposits	1,586,382	1,126,715
Interest bearing demand deposits, savings, and money markets	102,094	105,273
Certificates of deposit	100,403	134,553
Total deposits	1,788,879	1,366,541
Advances from Federal Home Loan Bank	7,000	7,000
Federal fund purchased	81,000	470,000
Securities sold under agreements to repurchase	14,221	10,411
Subordinated debentures	10,310	10,310
Accrued interest payable	255	318
Estimated Fair Value [Member]
Financial assets
Cash and cash equivalents	52,470	29,832
Securities available for sale	1,048,457	1,140,216
Securities held to maturity	302,549	279,312
Total securities	1,351,006	1,419,528
Loans receivable:
Total loans receivable	594,187	504,388
Federal Home Loan Bank stock	5,685	21,245
Accrued interest receivable	12,397	11,222
Financial liabilities
Noninterest bearing demand deposits	1,586,382	1,126,715
Interest bearing demand deposits, savings, and money markets	102,094	105,273
Certificates of deposit	100,481	134,746
Total deposits	1,788,957	1,366,734
Advances from Federal Home Loan Bank	8,746	8,789
Federal fund purchased	81,000	470,000
Securities sold under agreements to repurchase	14,221	10,411
Subordinated debentures	10,414	10,415
Accrued interest payable	255	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	104,057	111,254
One to Four Family Residential Mortgage Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	111,773	116,395
One to Four Family Residential Mortgage Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	104,057	111,254
Commercial and Multifamily Real Estate Loans [Member] \| Level 1 [Member]
Loans receivable:
Total loans receivable	0	0
Commercial and Multifamily Real Estate Loans [Member] \| Level 2 [Member]
Loans receivable:
Total loans receivable	0	0
Commercial and Multifamily Real Estate Loans [Member] \| Level 3 [Member]
Loans receivable:
Total loans receivable	259,745	234,845
Commercial and Multifamily Real Estate Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	251,022	224,302
Commercial and Multifamily Real Estate Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	259,745	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	57,442	58,651
Agricultural Real Estate Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	58,193	56,071
Agricultural Real Estate Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	57,442	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	33,939	29,580
Consumer Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	33,796	29,329
Consumer Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	33,939	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	23,594	25,660
Commercial Operating Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	28,057	30,846
Commercial Operating Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	23,594	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	39,627	44,398
Agricultural Operating Loans [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	39,325	42,258
Agricultural Operating Loans [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	39,627	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	75,783
Premium Finance [Member] \| Carrying Amount [Member]
Loans receivable:
Total loans receivable	74,156
Premium Finance [Member] \| Estimated Fair Value [Member]
Loans receivable:
Total loans receivable	$ 75,783

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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