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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Financial assets [Abstract]    
Securities available for sale $ 2,073,752 $ 1,693,431
Securities held to maturity 226,550 564,185
Financial liabilities [Abstract]    
Long-term debt 85,572 85,533
Level 1 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 107,563 1,267,586
Securities available for sale 1,851 1,445
Securities held to maturity 0 0
Total securities 1,851 1,445
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 17,604 19,380
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,850,886 2,454,057
Interest bearing demand deposits, savings, and money markets 236,812 169,557
Certificates of deposit 0 0
Deposits, Wholesale, Non-Maturing 63,083 18,245
Deposits, Wholesale, Certificates of Deposit 0 0
Total deposits 3,150,781 2,641,859
Advances from Federal Home Loan Bank   0
Federal Funds Purchased 314,000  
Federal fund purchased   987,000
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 1,315 2,280
Level 2 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 2,071,901 1,691,986
Securities held to maturity 226,550 564,185
Total securities 2,298,451 2,256,171
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 17,846 61,123
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 70,907 123,094
Deposits, Wholesale, Non-Maturing 0 0
Deposits, Wholesale, Certificates of Deposit 117,613 457,509
Total deposits 188,520 580,603
Advances from Federal Home Loan Bank   415,003
Federal Funds Purchased 0  
Federal fund purchased   0
Securities sold under agreements to repurchase 1,714 2,472
Long-term debt 1,907 1,938
Trust Preferred Securities 10,464 10,447
Subordinated debentures 75,188 76,500
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 1,530,891 1,318,402
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 0
Deposits, Wholesale, Certificates of Deposit 0 0
Total deposits 0 0
Advances from Federal Home Loan Bank   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 107,563 1,267,586
Securities available for sale 2,073,752 1,693,431
Securities held to maturity 235,011 563,529
Total securities 2,308,763 2,256,960
Loans receivable [Abstract]    
Total loans receivable 1,519,696 1,326,832
Federal Home Loan Bank stock 17,846 61,123
Accrued interest receivable 17,604 19,380
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,850,886 2,454,057
Interest bearing demand deposits, savings, and money markets 236,812 169,557
Certificates of deposit 71,712 123,637
Deposits, Wholesale, Non-Maturing 63,083 18,245
Deposits, Wholesale, Certificates of Deposit 118,004 457,928
Total deposits 3,340,497 3,223,424
Advances from Federal Home Loan Bank   415,000
Federal Funds Purchased 314,000  
Federal fund purchased   987,000
Securities sold under agreements to repurchase 1,714 2,472
Long-term debt 1,907 1,938
Trust Preferred Securities 10,310 10,310
Subordinated debentures 73,418 73,347
Accrued interest payable 1,315 2,280
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 107,563 1,267,586
Securities available for sale 2,073,752 1,693,431
Securities held to maturity 226,550 564,185
Total securities 2,300,302 2,257,616
Loans receivable [Abstract]    
Total loans receivable 1,530,891 1,318,402
Federal Home Loan Bank stock 17,846 61,123
Accrued interest receivable 17,604 19,380
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,850,886 2,454,057
Interest bearing demand deposits, savings, and money markets 236,812 169,557
Certificates of deposit 70,907 123,094
Deposits, Wholesale, Non-Maturing 63,083 18,245
Deposits, Wholesale, Certificates of Deposit 117,613 457,509
Total deposits 3,339,301 3,222,462
Advances from Federal Home Loan Bank   415,003
Federal Funds Purchased 314,000  
Federal fund purchased   987,000
Securities sold under agreements to repurchase 1,714 2,472
Long-term debt 1,907 1,938
Trust Preferred Securities 10,464 10,447
Subordinated debentures 75,188 76,500
Accrued interest payable 1,315 2,280
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 205,553 196,970
1-4 Family Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 205,994 196,706
1-4 Family Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 205,553 196,970
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 679,483 576,330
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 685,457 585,510
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 679,483 576,330
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 35,992 61,584
Agricultural Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 36,460 61,800
Agricultural Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 35,992 61,584
Consumer [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Consumer [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Consumer [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 299,959 163,961
Consumer [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 281,371 163,004
Consumer [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 299,959 163,961
Commercial Operating [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Operating [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Operating [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 46,987 35,723
Commercial Operating [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 47,461 35,759
Commercial Operating [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 46,987 35,723
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 22,226 32,870
Agricultural Operating [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 22,313 33,594
Agricultural Operating [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 22,226 32,870
Commercial Insurance Premium Finance [Member] | Level 1 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Insurance Premium Finance [Member] | Level 2 [Member]    
Loans receivable [Abstract]    
Total loans receivable 0 0
Commercial Insurance Premium Finance [Member] | Level 3 [Member]    
Loans receivable [Abstract]    
Total loans receivable 240,691 250,964
Commercial Insurance Premium Finance [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 240,640 250,459
Commercial Insurance Premium Finance [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable $ 240,691 $ 250,964