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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Financial assets [Abstract]    
Securities available for sale $ 1,442,798 $ 1,256,087
Securities held to maturity 618,150 346,847
Level 1 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 36,830 27,658
Securities available for sale 1,113 914
Securities held to maturity 0 0
Total securities 1,113 914
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 17,911 13,352
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 1,922,802 1,369,672
Interest bearing demand deposits, savings, and money markets 163,818 115,204
Certificates of deposit 0 0
Total deposits 2,086,620 1,484,876
Advances from Federal Home Loan Bank 0 0
Federal fund purchased 0 0
Securities sold under agreements to repurchase 0 0
Subordinated debentures 0 0
Accrued interest payable 337 272
Level 2 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 1,441,685 1,255,173
Securities held to maturity 618,150 346,847
Total securities 2,059,835 1,602,020
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 25,311 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 100,066 91,304
Total deposits 100,066 91,304
Advances from Federal Home Loan Bank 108,274 8,630
Federal fund purchased 437,000 540,000
Securities sold under agreements to repurchase 2,234 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 869,758 707,774
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 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 36,830 27,658
Securities available for sale 1,442,798 1,256,087
Securities held to maturity 604,589 345,744
Total securities 2,047,387 1,601,831
Loans receivable [Abstract]    
Total loans receivable 861,123 713,087
Federal Home Loan Bank stock 25,311 24,410
Accrued interest receivable 17,911 13,352
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 1,922,802 1,449,101
Interest bearing demand deposits, savings, and money markets 163,818 117,262
Certificates of deposit 100,336 91,171
Total deposits 2,186,956 1,657,534
Advances from Federal Home Loan Bank 107,000 7,000
Federal fund purchased 437,000 540,000
Securities sold under agreements to repurchase 2,234 4,007
Subordinated debentures 10,310 10,310
Accrued interest payable 337 272
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 36,830 27,658
Securities available for sale 1,442,798 1,256,087
Securities held to maturity 618,150 346,847
Total securities 2,060,948 1,602,934
Loans receivable [Abstract]    
Total loans receivable 869,758 707,774
Federal Home Loan Bank stock 25,311 24,410
Accrued interest receivable 17,911 13,352
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 1,922,802 1,369,672
Interest bearing demand deposits, savings, and money markets 163,818 115,204
Certificates of deposit 100,066 91,304
Total deposits 2,186,686 1,576,180
Advances from Federal Home Loan Bank 108,274 8,630
Federal fund purchased 437,000 540,000
Securities sold under agreements to repurchase 2,234 4,007
Subordinated debentures 10,430 10,416
Accrued interest payable 337 272
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 156,610 121,385
One to Four Family Residential Mortgage Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 150,461 125,021
One to Four Family Residential Mortgage Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 156,610 121,385
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 386,551 314,372
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 386,798 310,199
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 386,551 314,372
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 64,464 66,682
Agricultural Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 64,130 64,316
Agricultural Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 64,464 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 36,376 33,504
Consumer Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 36,986 33,527
Consumer Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 36,376 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 41,336 23,245
Commercial Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 40,971 29,893
Commercial Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 41,336 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 40,241 40,003
Agricultural Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 40,435 43,626
Agricultural Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 40,241 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 144,180 108,583
Premium Finance Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 141,342 106,505
Premium Finance Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable $ 144,180 $ 108,583