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FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) | Sep. 30, 2016 | Sep. 30, 2015
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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

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- Definition Fair value of asset backed securities investments classified as held To maturity. + References No definition available. + Details
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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 common equities and mutual funds as of the balance sheet date which have been categorized as available-for-sale. + References No definition available. + Details
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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 common equities and mutual funds as of the balance sheet date which have been categorized as held-to-maturity. + References No definition available. + Details
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- Definition Fair Value, Assets, total transfer amount between any of the levels 1, 2 or 3. + References No definition available. + Details
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- Definition Fair value of debt securities categorized as held-to-maturity. + References No definition available. + Details
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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. + References No definition available. + Details
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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 held-to-maturity. + References No definition available. + Details
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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 obligations of states and political subdivision as of the balance sheet date which have been categorized as available-for-sale. + References No definition available. + Details
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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 obligations of states and political subdivision as of the balance sheet date which have been categorized as held-to-maturity. + References No definition available. + Details
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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 debt securities issued by the Small Business Administration (SBA) as of the balance sheet date which have been categorized as available-for-sale. + References No definition available. + Details
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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 debt securities issued by the Small Business Administration (SBA) as of the balance sheet date which have been categorized as held-to-maturity. + References No definition available. + Details
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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 trust preferred and corporate securities as of the balance sheet date which have been categorized as available-for-sale. + References No definition available. + Details
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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 trust preferred and corporate securities as of the balance sheet date which have been categorized as held-to-maturity. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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