FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between levels of fair value hierarchy	$ 0	$ 0
Available For Sale
Total debt securities	586,454,000	558,940,000
Total securities	1,693,431,000	1,469,249,000
Held To Maturity
Total securities	564,185,000	632,574,000
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	292,000	76,000
Level 1 [Member]
Available For Sale
Total securities	1,445,000	1,125,000
Held To Maturity
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
Total securities	1,691,986,000	1,468,124,000
Held To Maturity
Total securities	564,185,000	632,574,000
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
Total securities	0	0
Held To Maturity
Total securities	0	0
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	1,318,402,000	926,803,000
Level 3 [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	196,970,000	163,886,000
Level 3 [Member] \| Commercial and Multi-Family Real Estate [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	576,330,000	422,307,000
Level 3 [Member] \| Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net	32,870,000	36,897,000
Recurring [Member]
Available For Sale
Trust preferred and corporate securities		12,978,000
Small business administration securities	57,871,000	80,719,000
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	950,829,000	698,672,000
Mortgage-backed securities	586,454,000	558,940,000
Total debt securities	1,691,986,000	1,468,124,000
Common Equities and Mutual Funds, Available-for-Sale	1,445,000	1,125,000
Total securities	1,693,431,000	1,469,249,000
Held To Maturity
Trust preferred and corporate securities		0
Small business administration securities	0	0
Obligations of states and political subdivisions	19,368,000	20,937,000
Non-bank qualified obligations of states and political subdivisions	432,361,000	477,202,000
Mortgage-backed securities	112,456,000	134,435,000
Total debt securities	564,185,000	632,574,000
Common equities and mutual funds	0	0
Total securities	564,185,000	632,574,000
Asset Backed Securities Available For Sale Fair Value Disclosure	96,832,000	116,815,000
Asset Backed Securities Held To Maturity	0	0
Recurring [Member] \| Level 1 [Member]
Available For Sale
Trust preferred and corporate securities		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	1,445,000	1,125,000
Total securities	1,445,000	1,125,000
Held To Maturity
Trust preferred and corporate securities		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	0
Asset Backed Securities Held To Maturity	0	0
Recurring [Member] \| Level 2 [Member]
Available For Sale
Trust preferred and corporate securities		12,978,000
Small business administration securities	57,871,000	80,719,000
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	950,829,000	698,672,000
Mortgage-backed securities	586,454,000	558,940,000
Total debt securities	1,691,986,000	1,468,124,000
Common Equities and Mutual Funds, Available-for-Sale	0	0
Total securities	1,691,986,000	1,468,124,000
Held To Maturity
Trust preferred and corporate securities		0
Small business administration securities	0	0
Obligations of states and political subdivisions	19,368,000	20,937,000
Non-bank qualified obligations of states and political subdivisions	432,361,000	477,202,000
Mortgage-backed securities	112,456,000	134,435,000
Total debt securities	564,185,000	632,574,000
Common equities and mutual funds	0	0
Total securities	564,185,000	632,574,000
Asset Backed Securities Available For Sale Fair Value Disclosure	96,832,000	116,815,000
Asset Backed Securities Held To Maturity	0	0
Recurring [Member] \| Level 3 [Member]
Available For Sale
Trust preferred and corporate securities		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
Trust preferred and corporate securities		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	0
Asset Backed Securities Held To Maturity	0	0
Nonrecurring [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Total	292,000	144,000
Nonrecurring [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		68,000
Nonrecurring [Member] \| One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		68,000
Nonrecurring [Member] \| Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Foreclosed real estate and repossessed assets	292,000	76,000
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
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] \| 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
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] \| 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	292,000	144,000
Nonrecurring [Member] \| Level 3 [Member] \| Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Impaired Loans, Net		68,000
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		68,000
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	$ 292,000	$ 76,000

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

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

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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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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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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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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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