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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Financial assets [Abstract]    
Securities available for sale $ 1,827,273 $ 1,469,249
Securities held to maturity 594,423 632,574
Financial liabilities [Abstract]    
Long-term debt 92,497 92,460
Level 1 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 67,293 773,830
Securities available for sale 1,555 1,125
Securities held to maturity 0 0
Total securities 1,555 1,125
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 20,902 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,637,167 2,167,522
Interest bearing demand deposits, savings, and money markets 151,971 136,568
Certificates of deposit 0 0
Deposits, Wholesale, Non-Maturing 21,923  
Total deposits 2,811,061 2,304,090
Advances from Federal Home Loan Bank 0 0
Federal fund purchased   992,000
Securities sold under agreements to repurchase 0 0
Long-term debt 0 0
Trust Preferred Securities 0 0
Subordinated debentures 0 0
Accrued interest payable 722 875
Level 2 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 1,825,718 1,468,124
Securities held to maturity 594,423 632,574
Total securities 2,420,141 2,100,698
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 25,043 47,512
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 60,689 125,772
Deposits, Wholesale, Non-Maturing 0  
Total deposits 60,689 125,772
Advances from Federal Home Loan Bank 7,891 108,168
Federal fund purchased   0
Securities sold under agreements to repurchase 1,848 3,039
Long-term debt 1,980 2,018
Trust Preferred Securities 10,446 10,437
Subordinated debentures 75,375 77,250
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 1,141,191 926,803
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
Deposits, Wholesale, Non-Maturing 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
Long-term debt 0 0
Trust Preferred Securities 0 0
Subordinated debentures 0 0
Accrued interest payable 0 0
Carrying Amount [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 67,293 773,830
Securities available for sale 1,827,273 1,469,249
Securities held to maturity 596,803 619,853
Total securities 2,424,076 2,089,102
Loans receivable [Abstract]    
Total loans receivable 1,152,382 925,894
Federal Home Loan Bank stock 25,043 47,512
Accrued interest receivable 20,902 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,637,167 2,167,522
Interest bearing demand deposits, savings, and money markets 151,971 136,568
Certificates of deposit 61,170 125,992
Deposits, Wholesale, Non-Maturing 21,923  
Total deposits 2,872,231 2,430,082
Advances from Federal Home Loan Bank 7,000 107,000
Federal fund purchased   992,000
Securities sold under agreements to repurchase 1,848 3,039
Long-term debt 1,980 2,018
Trust Preferred Securities 10,310 10,310
Subordinated debentures 73,278 73,211
Accrued interest payable 722 875
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 67,293 773,830
Securities available for sale 1,827,273 1,469,249
Securities held to maturity 594,423 632,574
Total securities 2,421,696 2,101,823
Loans receivable [Abstract]    
Total loans receivable 1,141,191 926,803
Federal Home Loan Bank stock 25,043 47,512
Accrued interest receivable 20,902 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,637,167 2,167,522
Interest bearing demand deposits, savings, and money markets 151,971 136,568
Certificates of deposit 60,689 125,772
Deposits, Wholesale, Non-Maturing 21,923  
Total deposits 2,871,750 2,429,862
Advances from Federal Home Loan Bank 7,891 108,168
Federal fund purchased   992,000
Securities sold under agreements to repurchase 1,848 3,039
Long-term debt 1,980 2,018
Trust Preferred Securities 10,446 10,437
Subordinated debentures 75,375 77,250
Accrued interest payable 722 875
1-4 Family Real Estate [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
1-4 Family Real Estate [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
1-4 Family Real Estate [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 176,879 163,886
1-4 Family Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 178,310 162,298
1-4 Family Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 176,879 163,886
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 464,071 422,307
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 473,058 422,932
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 464,071 422,307
Agricultural Real Estate [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Real Estate [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Real Estate [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 58,829 63,868
Agricultural Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 62,422 63,612
Agricultural Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 58,829 63,868
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 181,687 36,738
Consumer Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 182,156 37,094
Consumer Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 181,687 36,738
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 34,004 31,108
Commercial Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 33,894 31,271
Commercial Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 34,004 31,108
Agricultural Operating [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Operating [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Agricultural Operating [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,394 36,897
Agricultural Operating [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,493 37,083
Agricultural Operating [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,394 36,897
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 190,327 172,000
Premium Finance Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 187,049 171,604
Premium Finance Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable $ 190,327 $ 172,000