FAIR VALUES OF FINANCIAL INSTRUMENTS, BALANCE SHEET GROUPING (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Financial assets [Abstract]
Securities available for sale	$ 881,193	$ 1,116,692
Securities held to maturity	270,518	0
Level 1 [Member]
Financial assets [Abstract]
Cash and cash equivalents	40,063	145,051
Securities available for sale	0	0
Securities held to maturity	0
Loans receivable net [Abstract]
One to four family residential mortgage loans	0	0
Commercial and multi-family real estate loans	0	0
Agricultural real estate loans	0	0
Consumer loans	0	0
Consumer loans held for sale		0
Commercial operating loans	0	0
Agricultural operating loans	0	0
Total loans receivable, net	0	0
FHLB stock	0	0
Accrued interest receivable	8,582	6,710
Financial liabilities [Abstract]
Noninterest bearing demand deposits	1,086,258	1,181,299
Interest bearing demand deposits, savings, and money markets	97,426	97,732
Certificates of deposit	0	0
Total deposits	1,183,684	1,279,031
Advances from FHLB	0	0
Federal funds purchased	0
Securities sold under agreements to repurchase	0	0
Subordinated debentures	0	0
Accrued interest payable	291	177
Level 2 [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Securities available for sale	881,193	1,116,692
Securities held to maturity	270,518
Loans receivable net [Abstract]
One to four family residential mortgage loans	0	0
Commercial and multi-family real estate loans	0	0
Agricultural real estate loans	0	0
Consumer loans	0	0
Consumer loans held for sale		0
Commercial operating loans	0	0
Agricultural operating loans	0	0
Total loans receivable, net	0	0
FHLB stock	9,994	2,120
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Noninterest bearing demand deposits	0	0
Interest bearing demand deposits, savings, and money markets	0	0
Certificates of deposit	132,187	101,701
Total deposits	132,187	101,701
Advances from FHLB	9,089	13,999
Federal funds purchased	190,001
Securities sold under agreements to repurchase	9,148	26,400
Subordinated debentures	10,312	10,318
Accrued interest payable	0	0
Level 3 [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Securities available for sale	0	0
Securities held to maturity	0
Loans receivable net [Abstract]
One to four family residential mortgage loans	72,628	49,936
Commercial and multi-family real estate loans	200,778	194,781
Agricultural real estate loans	30,920	21,033
Consumer loans	30,588	33,488
Consumer loans held for sale		0
Commercial operating loans	15,718	15,396
Agricultural operating loans	35,175	22,714
Total loans receivable, net	385,807	337,348
FHLB stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
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 FHLB	0	0
Federal funds purchased	0
Securities sold under agreements to repurchase	0	0
Subordinated debentures	0	0
Accrued interest payable	0	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	40,063	145,051
Securities available for sale	881,193	1,116,692
Securities held to maturity	288,026
Loans receivable net [Abstract]
One to four family residential mortgage loans	82,287	49,134
Commercial and multi-family real estate loans	192,786	191,905
Agricultural real estate loans	29,552	19,861
Consumer loans	30,314	32,838
Consumer loans held for sale		0
Commercial operating loans	16,264	16,452
Agricultural operating loans	33,750	20,981
Total loans receivable, net	384,953	331,171
FHLB stock	9,994	2,120
Accrued interest receivable	8,582	6,710
Financial liabilities [Abstract]
Noninterest bearing demand deposits	1,086,258	1,181,299
Interest bearing demand deposits, savings, and money markets	97,426	97,732
Certificates of deposit	131,599	100,763
Total deposits	1,315,283	1,379,794
Advances from FHLB	7,000	11,000
Federal funds purchased	190,000
Securities sold under agreements to repurchase	9,146	26,400
Subordinated debentures	10,310	10,310
Accrued interest payable	291	177
Estimated Fair Value [Member]
Financial assets [Abstract]
Cash and cash equivalents	40,063	145,051
Securities available for sale	881,193	1,116,692
Securities held to maturity	270,518
Loans receivable net [Abstract]
One to four family residential mortgage loans	72,628	49,936
Commercial and multi-family real estate loans	200,778	194,781
Agricultural real estate loans	30,920	21,033
Consumer loans	30,588	33,488
Consumer loans held for sale		0
Commercial operating loans	15,718	15,396
Agricultural operating loans	35,175	22,714
Total loans receivable, net	385,807	337,348
FHLB stock	9,994	2,120
Accrued interest receivable	8,582	6,710
Financial liabilities [Abstract]
Noninterest bearing demand deposits	1,086,258	1,181,299
Interest bearing demand deposits, savings, and money markets	97,426	97,732
Certificates of deposit	132,187	101,701
Total deposits	1,315,871	1,380,732
Advances from FHLB	9,089	13,999
Federal funds purchased	190,000
Securities sold under agreements to repurchase	9,146	26,400
Subordinated debentures	10,312	10,318
Accrued interest payable	$ 291	$ 177

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