FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between levels of fair value hierarchy	$ 0	$ 0
Available-for-sale Securities [Abstract]
Total debt securities	558,940,000	576,583,000
Total securities	1,469,249,000	1,256,087,000
Held-to-maturity Securities [Abstract]
Total securities	632,574,000	346,847,000
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	76,000	0
Level 1 [Member]
Available-for-sale Securities [Abstract]
Total securities	1,125,000	914,000
Held-to-maturity Securities [Abstract]
Total securities	0	0
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 1 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 1 [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 1 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 2 [Member]
Available-for-sale Securities [Abstract]
Total securities	1,468,124,000	1,255,173,000
Held-to-maturity Securities [Abstract]
Total securities	632,574,000	346,847,000
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 2 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 2 [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 2 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Level 3 [Member]
Available-for-sale Securities [Abstract]
Total securities	0	0
Held-to-maturity Securities [Abstract]
Total securities	0	0
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	926,803,000	707,774,000
Level 3 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	163,886,000	121,385,000
Level 3 [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	422,307,000	314,372,000
Level 3 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	36,897,000	40,003,000
Recurring [Member]
Available-for-sale Securities [Abstract]
Trust preferred and corporate securities	12,978,000	13,944,000
Small business administration securities	80,719,000	56,056,000
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	698,672,000	608,590,000
Mortgage-backed securities	558,940,000	576,583,000
Total debt securities	1,468,124,000	1,255,173,000
Common Equities and Mutual Funds, Available-for-Sale	1,125,000	914,000
Total securities	1,469,249,000	1,256,087,000
Held-to-maturity Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	20,937,000	19,413,000
Non-bank qualified obligations of states and political subdivisions	477,202,000	261,330,000
Mortgage-backed securities	134,435,000	66,104,000
Total debt securities	632,574,000	346,847,000
Common equities and mutual funds	0	0
Total securities	632,574,000	346,847,000
Asset Backed Securities Available For Sale Fair Value Disclosure	116,815,000
Asset Backed Securities Held To Maturity	0
Recurring [Member] \| Level 1 [Member]
Available-for-sale Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	0	0
Mortgage-backed securities	0	0
Total debt securities	0	0
Common Equities and Mutual Funds, Available-for-Sale	1,125,000	914,000
Total securities	1,125,000	914,000
Held-to-maturity Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	0	0
Mortgage-backed securities	0	0
Total debt securities	0	0
Common equities and mutual funds	0	0
Total securities	0	0
Asset Backed Securities Available For Sale Fair Value Disclosure	0
Asset Backed Securities Held To Maturity	0
Recurring [Member] \| Level 2 [Member]
Available-for-sale Securities [Abstract]
Trust preferred and corporate securities	12,978,000	13,944,000
Small business administration securities	80,719,000	56,056,000
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	698,672,000	608,590,000
Mortgage-backed securities	558,940,000	576,583,000
Total debt securities	1,468,124,000	1,255,173,000
Common Equities and Mutual Funds, Available-for-Sale	0	0
Total securities	1,468,124,000	1,255,173,000
Held-to-maturity Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	20,937,000	19,413,000
Non-bank qualified obligations of states and political subdivisions	477,202,000	261,330,000
Mortgage-backed securities	134,435,000	66,104,000
Total debt securities	632,574,000	346,847,000
Common equities and mutual funds	0	0
Total securities	632,574,000	346,847,000
Asset Backed Securities Available For Sale Fair Value Disclosure	116,815,000
Asset Backed Securities Held To Maturity	0
Recurring [Member] \| Level 3 [Member]
Available-for-sale Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	0	0
Mortgage-backed securities	0	0
Total debt securities	0	0
Common Equities and Mutual Funds, Available-for-Sale	0	0
Total securities	0	0
Held-to-maturity Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	0	0
Mortgage-backed securities	0	0
Total debt securities	0	0
Common equities and mutual funds	0	0
Total securities	0	0
Asset Backed Securities Available For Sale Fair Value Disclosure	0
Asset Backed Securities Held To Maturity	0
Nonrecurring [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Total	144,000	2,543,000
Nonrecurring [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	68,000	2,543,000
Nonrecurring [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		663,000
Nonrecurring [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		1,880,000
Nonrecurring [Member] \| Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	76,000	0
Nonrecurring [Member] \| Level 1 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Total	0	0
Nonrecurring [Member] \| Level 1 [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Nonrecurring [Member] \| Level 1 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Level 1 [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Level 1 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Level 1 [Member] \| Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	0	0
Nonrecurring [Member] \| Level 2 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Total	0	0
Nonrecurring [Member] \| Level 2 [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	0	0
Nonrecurring [Member] \| Level 2 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Level 2 [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Level 2 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Level 2 [Member] \| Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	0	0
Nonrecurring [Member] \| Level 3 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Total	144,000	2,543,000
Nonrecurring [Member] \| Level 3 [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	68,000	2,543,000
Nonrecurring [Member] \| Level 3 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		0
Nonrecurring [Member] \| Level 3 [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		663,000
Nonrecurring [Member] \| Level 3 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		1,880,000
Nonrecurring [Member] \| Level 3 [Member] \| Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	$ 76,000	$ 0

Fair value of asset backed securities investments classified as available for sale.

No definition available.

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Fair value of asset backed securities investments classified as held To maturity.

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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 common equities and mutual funds as of the balance sheet date which have been categorized as available-for-sale.

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Fair Value, Assets, total transfer amount between any of the levels 1, 2 or 3.

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Fair value of debt securities categorized as held-to-maturity.

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- Definition

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 non-bank qualified obligations of states and political subdivision as of the balance sheet date which have been categorized as available-for-sale.

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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 non-bank qualified obligations of states and political subdivision as of the balance sheet date which have been categorized as held-to-maturity.

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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 obligations of states and political subdivision as of the balance sheet date which have been categorized as held-to-maturity.

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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 debt securities issued by the Small Business Administration (SBA) as of the balance sheet date which have been categorized as available-for-sale.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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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 of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4437-111522

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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