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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Financial assets [Abstract]    
Securities available for sale $ 1,808,108 $ 1,469,249
Securities held to maturity 581,921 632,574
Financial liabilities [Abstract]    
Long-term debt 92,514 92,460
Level 1 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 65,630 773,830
Securities available for sale 1,445 1,125
Securities held to maturity 0 0
Total securities 1,445 1,125
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 21,831 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,481,673 2,167,522
Interest bearing demand deposits, savings, and money markets 142,929 136,568
Certificates of deposit 0 0
Deposits, Wholesale, Non-Maturing 23,505  
Deposits, Wholesale, Certificates of Deposit 0  
Total deposits 2,648,107 2,304,090
Advances from Federal Home Loan Bank 0 0
Federal Funds Purchased 275,000  
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 2,463 875
Level 2 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 1,806,663 1,468,124
Securities held to maturity 581,921 632,574
Total securities 2,388,584 2,100,698
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 16,323 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 83,190 125,772
Deposits, Wholesale, Non-Maturing 0  
Deposits, Wholesale, Certificates of Deposit 420,680  
Total deposits 503,870 125,772
Advances from Federal Home Loan Bank 7,807 108,168
Federal Funds Purchased 0  
Federal fund purchased   0
Securities sold under agreements to repurchase 2,100 3,039
Long-term debt 1,958 2,018
Trust Preferred Securities 10,446 10,437
Subordinated debentures 75,750 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 1,214,592 926,803
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  
Deposits, Wholesale, Certificates of Deposit 0  
Total deposits 0 0
Advances from Federal Home Loan Bank 0 0
Federal Funds Purchased 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 65,630 773,830
Securities available for sale 1,808,108 1,469,249
Securities held to maturity 582,128 619,853
Total securities 2,390,236 2,089,102
Loans receivable [Abstract]    
Total loans receivable 1,225,396 925,894
Federal Home Loan Bank stock 16,323 47,512
Accrued interest receivable 21,831 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,481,673 2,167,522
Interest bearing demand deposits, savings, and money markets 142,929 136,568
Certificates of deposit 83,760 125,992
Deposits, Wholesale, Non-Maturing 23,505  
Deposits, Wholesale, Certificates of Deposit 421,352  
Total deposits 3,153,219 2,430,082
Advances from Federal Home Loan Bank 7,000 107,000
Federal Funds Purchased 275,000  
Federal fund purchased   992,000
Securities sold under agreements to repurchase 2,100 3,039
Long-term debt 1,958 2,018
Trust Preferred Securities 10,310 10,310
Subordinated debentures 73,312 73,211
Accrued interest payable 2,463 875
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 65,630 773,830
Securities available for sale 1,808,108 1,469,249
Securities held to maturity 581,921 632,574
Total securities 2,390,029 2,101,823
Loans receivable [Abstract]    
Total loans receivable 1,214,592 926,803
Federal Home Loan Bank stock 16,323 47,512
Accrued interest receivable 21,831 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,481,673 2,167,522
Interest bearing demand deposits, savings, and money markets 142,929 136,568
Certificates of deposit 83,190 125,772
Deposits, Wholesale, Non-Maturing 23,505  
Deposits, Wholesale, Certificates of Deposit 420,680  
Total deposits 3,151,977 2,429,862
Advances from Federal Home Loan Bank 7,807 108,168
Federal Funds Purchased 275,000  
Federal fund purchased   992,000
Securities sold under agreements to repurchase 2,100 3,039
Long-term debt 1,958 2,018
Trust Preferred Securities 10,446 10,437
Subordinated debentures 75,750 77,250
Accrued interest payable 2,463 875
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 188,813 163,886
1-4 Family Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 190,731 162,298
1-4 Family Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 188,813 163,886
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 484,155 422,307
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 493,859 422,932
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 484,155 422,307
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 62,275 63,868
Agricultural Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 62,521 63,612
Agricultural Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 62,275 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 173,416 36,738
Consumer Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 172,151 37,094
Consumer Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 173,416 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 38,965 31,108
Commercial Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 39,076 31,271
Commercial Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 38,965 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 35,395 36,897
Agricultural Operating [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,471 37,083
Agricultural Operating [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,395 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 231,573 172,000
Premium Finance Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 231,587 171,604
Premium Finance Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable $ 231,573 $ 172,000