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FAIR VALUE MEASUREMENTS, Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Financial assets [Abstract]    
Securities available for sale $ 1,555,104 $ 1,256,087
Securities held to maturity 493,350 346,847
Level 1 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 39,480 27,658
Securities available for sale 1,106 914
Securities held to maturity 0 0
Total securities 1,106 914
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 15,783 13,352
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,013,783 1,369,672
Interest bearing demand deposits, savings, and money markets 155,177 115,204
Certificates of deposit 0 0
Total deposits 2,168,959 1,484,876
Advances from Federal Home Loan Bank 0 0
Federal fund purchased   0
Securities sold under agreements to repurchase 0 0
Subordinated debentures 0 0
Accrued interest payable 167 272
Level 2 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 1,553,998 1,255,173
Securities held to maturity 493,350 346,847
Total securities 2,047,348 1,602,020
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 22,431 24,410
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 51,585 91,304
Total deposits 51,585 91,304
Advances from Federal Home Loan Bank 8,335 8,630
Federal fund purchased 465,000 540,000
Securities sold under agreements to repurchase 1,626 4,007
Subordinated debentures 10,430 10,416
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 0
Total securities 0 0
Loans receivable [Abstract]    
Total loans receivable 783,778 707,774
Federal Home Loan Bank 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 Federal Home Loan Bank 0 0
Federal fund 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 39,480 27,658
Securities available for sale 1,555,104 1,256,087
Securities held to maturity 485,768 345,744
Total securities 2,040,871 1,601,831
Loans receivable [Abstract]    
Total loans receivable 785,404 713,087
Federal Home Loan Bank stock 22,431 24,410
Accrued interest receivable 15,783 13,352
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,013,783 1,449,101
Interest bearing demand deposits, savings, and money markets 155,177 117,262
Certificates of deposit 51,801 91,171
Total deposits 2,220,761 1,657,534
Advances from Federal Home Loan Bank 7,000 7,000
Federal fund purchased 465,000 540,000
Securities sold under agreements to repurchase 1,626 4,007
Subordinated debentures 10,310 10,310
Accrued interest payable 167 272
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 39,480 27,658
Securities available for sale 1,555,104 1,256,087
Securities held to maturity 493,350 346,847
Total securities 2,048,454 1,602,934
Loans receivable [Abstract]    
Total loans receivable 783,778 707,774
Federal Home Loan Bank stock 22,431 24,410
Accrued interest receivable 15,783 13,352
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,013,783 1,369,672
Interest bearing demand deposits, savings, and money markets 155,177 115,204
Certificates of deposit 51,585 91,304
Total deposits 2,220,544 1,576,180
Advances from Federal Home Loan Bank 8,335 8,630
Federal fund purchased 465,000 540,000
Securities sold under agreements to repurchase 1,626 4,007
Subordinated debentures 10,430 10,416
Accrued interest payable 167 272
One to Four Family Residential Mortgage Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
One to Four Family Residential Mortgage Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
One to Four Family Residential Mortgage Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 141,183 121,385
One to Four Family Residential Mortgage Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 140,000 125,021
One to Four Family Residential Mortgage Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 141,183 121,385
Commercial and Multi-family Real Estate Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial and Multi-family Real Estate Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial and Multi-family Real Estate Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 353,769 314,372
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 354,794 310,199
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 353,769 314,372
Agricultural Real Estate Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Real Estate Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Real Estate Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 63,960 66,682
Agricultural Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 64,111 64,316
Agricultural Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 63,960 66,682
Consumer Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Consumer Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Consumer Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,341 33,504
Consumer Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,937 33,527
Consumer Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,341 33,504
Commercial Operating Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Operating Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Operating Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 27,085 23,245
Commercial Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 26,909 29,893
Commercial Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 27,085 23,245
Agricultural Operating Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Operating Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Operating Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 38,364 40,003
Agricultural Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 42,081 43,626
Agricultural Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 38,364 40,003
Premium Finance Loans [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Premium Finance Loans [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Premium Finance Loans [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 124,075 108,583
Premium Finance Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 121,572 106,505
Premium Finance Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable $ 124,075 $ 108,583