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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014
Available-for-sale Securities [Abstract]
Total debt securities	$ 596,976	$ 657,870
Total available for sale securities	1,159,786	1,140,216
Held-to-maturity Securities [Abstract]
Total held to maturity securities	326,989	279,312
Level 1 [Member]
Available-for-sale Securities [Abstract]
Total available for sale securities	966	825
Held-to-maturity Securities [Abstract]
Total held to maturity securities	0	0
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] | One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] | Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] | Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] | Consumer Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 1 [Member] | Commercial Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member]
Available-for-sale Securities [Abstract]
Total available for sale securities	1,158,820	1,139,391
Held-to-maturity Securities [Abstract]
Total held to maturity securities	326,989	279,312
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] | One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] | Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] | Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] | Consumer Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 2 [Member] | Commercial Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Level 3 [Member]
Available-for-sale Securities [Abstract]
Total available for sale securities	0	0
Held-to-maturity Securities [Abstract]
Total held to maturity securities	0	0
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	656,960	504,388
Level 3 [Member] | Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	4,391	1,152
Level 3 [Member] | One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	117,325	111,254
Level 3 [Member] | Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	281,441	234,845
Level 3 [Member] | Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	39,191	44,398
Level 3 [Member] | Consumer Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	34,131	29,580
Level 3 [Member] | Commercial Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	24,927	25,660
Level 3 [Member] | Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	54	15
Recurring [Member]
Available-for-sale Securities [Abstract]
Trust preferred and corporate securities	16,992	46,929
Small business administration securities	37,150	67,012
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	507,702	367,580
Mortgage-backed securities	596,976	657,870
Total debt securities	1,158,820	1,139,391
Common equities and mutual funds	966	825
Total available for sale securities	1,159,786	1,140,216
Held-to-maturity Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	18,876	18,980
Non-bank qualified obligations of states and political subdivisions	240,693	192,160
Mortgage-backed securities	67,420	68,172
Total debt securities	326,989	279,312
Common equities and mutual funds	0	0
Total held to maturity securities	326,989	279,312
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	966	825
Total available for sale securities	966	825
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 held to maturity securities	0	0
Recurring [Member] | Level 2 [Member]
Available-for-sale Securities [Abstract]
Trust preferred and corporate securities	16,992	46,929
Small business administration securities	37,150	67,012
Obligations of states and political subdivisions	0	0
Non-bank qualified obligations of states and political subdivisions	507,702	367,580
Mortgage-backed securities	596,976	657,870
Total debt securities	1,158,820	1,139,391
Common equities and mutual funds	0	0
Total available for sale securities	1,158,820	1,139,391
Held-to-maturity Securities [Abstract]
Trust preferred and corporate securities	0	0
Small business administration securities	0	0
Obligations of states and political subdivisions	18,876	18,980
Non-bank qualified obligations of states and political subdivisions	240,693	192,160
Mortgage-backed securities	67,420	68,172
Total debt securities	326,989	279,312
Common equities and mutual funds	0	0
Total held to maturity securities	326,989	279,312
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	0	0
Total available for sale 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 held to maturity securities	0	0
Nonrecurring [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	4,445	1,167
Nonrecurring [Member] | Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	4,391	1,152
Nonrecurring [Member] | One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	222
Nonrecurring [Member] | Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	683	930
Nonrecurring [Member] | Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	3,708
Nonrecurring [Member] | Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	54	15
Nonrecurring [Member] | Level 1 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] | Level 1 [Member] | Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	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]
Fair value	0	0
Nonrecurring [Member] | Level 1 [Member] | Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] | Level 1 [Member] | Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0
Nonrecurring [Member] | Level 1 [Member] | Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] | Level 2 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] | Level 2 [Member] | Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	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]
Fair value	0	0
Nonrecurring [Member] | Level 2 [Member] | Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] | Level 2 [Member] | Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0
Nonrecurring [Member] | Level 2 [Member] | Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	0
Nonrecurring [Member] | Level 3 [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	4,445	1,167
Nonrecurring [Member] | Level 3 [Member] | Total Impaired Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	4,391	1,152
Nonrecurring [Member] | Level 3 [Member] | One to Four Family Residential Mortgage Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	0	222
Nonrecurring [Member] | Level 3 [Member] | Commercial and Multi-family Real Estate Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	683	930
Nonrecurring [Member] | Level 3 [Member] | Agricultural Operating Loans [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	3,708
Nonrecurring [Member] | Level 3 [Member] | Foreclosed Assets, Net [Member]
Fair value of assets measured on non-recurring basis [Abstract]
Fair value	$ 54	$ 15

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