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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Financial assets [Abstract]    
Securities available for sale $ 1,471,771 $ 1,469,249
Securities held to maturity 599,101 632,574
Loans held for sale 1,223 0
Financial liabilities [Abstract]    
Long-term debt 92,479 92,460
Level 1 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 695,731 773,830
Securities available for sale 1,254 1,125
Securities held to maturity 0 0
Total securities 1,254 1,125
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 0 0
Accrued interest receivable 21,375 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,473,275 2,167,522
Interest bearing demand deposits, savings, and money markets 140,541 136,568
Certificates of deposit 0 0
Deposits, Wholesale, Non-Maturing 499,608  
Deposits, Wholesale, Certificates of Deposit 0  
Total deposits 3,113,424 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 2,255 875
Level 2 [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 0 0
Securities available for sale 1,470,517 1,468,124
Securities held to maturity 599,101 632,574
Total securities 2,069,618 2,100,698
Loans receivable [Abstract]    
Total loans receivable 0 0
Federal Home Loan Bank stock 3,832 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 121,830 125,772
Deposits, Wholesale, Non-Maturing 0  
Deposits, Wholesale, Certificates of Deposit 426,960  
Total deposits 548,790 125,772
Advances from Federal Home Loan Bank 7,940 108,168
Federal fund purchased   0
Securities sold under agreements to repurchase 3,782 3,039
Long-term debt 2,000 2,018
Trust Preferred Securities 10,436 10,437
Subordinated debentures 76,843 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 1,103,699 926,803
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 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 695,731 773,830
Securities available for sale 1,471,771 1,469,249
Securities held to maturity 604,976 619,853
Total securities 2,076,747 2,089,102
Loans receivable [Abstract]    
Total loans receivable 1,114,516 925,894
Federal Home Loan Bank stock 3,832 47,512
Accrued interest receivable 21,375 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,473,275 2,167,522
Interest bearing demand deposits, savings, and money markets 140,541 136,568
Certificates of deposit 122,334 125,992
Deposits, Wholesale, Non-Maturing 499,608  
Deposits, Wholesale, Certificates of Deposit 427,379  
Total deposits 3,663,137 2,430,082
Advances from Federal Home Loan Bank 7,000 107,000
Federal fund purchased   992,000
Securities sold under agreements to repurchase 3,782 3,039
Long-term debt 2,000 2,018
Trust Preferred Securities 10,310 10,310
Subordinated debentures 73,244 73,211
Accrued interest payable 2,255 875
Estimated Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents 695,731 773,830
Securities available for sale 1,471,771 1,469,249
Securities held to maturity 599,101 632,574
Total securities 2,070,872 2,101,823
Loans receivable [Abstract]    
Total loans receivable 1,103,699 926,803
Federal Home Loan Bank stock 3,832 47,512
Accrued interest receivable 21,375 17,199
Financial liabilities [Abstract]    
Noninterest bearing demand deposits 2,473,275 2,167,522
Interest bearing demand deposits, savings, and money markets 140,541 136,568
Certificates of deposit 121,830 125,772
Deposits, Wholesale, Non-Maturing 499,608  
Deposits, Wholesale, Certificates of Deposit 426,960  
Total deposits 3,662,214 2,429,862
Advances from Federal Home Loan Bank 7,940 108,168
Federal fund purchased   992,000
Securities sold under agreements to repurchase 3,782 3,039
Long-term debt 2,000 2,018
Trust Preferred Securities 10,436 10,437
Subordinated debentures 76,843 77,250
Accrued interest payable 2,255 875
1-4 Family Real Estate [Member] | Level 1 [Member]    
Financial assets [Abstract]    
Loans held for sale 0  
Loans receivable [Abstract]    
Total loans receivable 0 0
1-4 Family Real Estate [Member] | Level 2 [Member]    
Financial assets [Abstract]    
Loans held for sale 1,223  
Loans receivable [Abstract]    
Total loans receivable 0 0
1-4 Family Real Estate [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Loans held for sale 0  
Loans receivable [Abstract]    
Total loans receivable 170,283 163,886
1-4 Family Real Estate [Member] | Carrying Amount [Member]    
Financial assets [Abstract]    
Loans held for sale 1,223  
Loans receivable [Abstract]    
Total loans receivable 172,877 162,298
1-4 Family Real Estate [Member] | Estimated Fair Value [Member]    
Financial assets [Abstract]    
Loans held for sale 1,223  
Loans receivable [Abstract]    
Total loans receivable 170,283 163,886
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 432,143 422,307
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 440,512 422,932
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 432,143 422,307
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 62,973 63,868
Agricultural Real Estate [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 64,014 63,612
Agricultural Real Estate [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 62,973 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 174,796 36,738
Consumer Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 173,164 37,094
Consumer Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 174,796 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 50,149 31,108
Commercial Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 50,824 31,271
Commercial Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 50,149 31,108
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 33,481 36,897
Agricultural Operating Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 33,617 37,083
Agricultural Operating Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable 33,481 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 179,874 172,000
Premium Finance Loans [Member] | Carrying Amount [Member]    
Loans receivable [Abstract]    
Total loans receivable 179,508 171,604
Premium Finance Loans [Member] | Estimated Fair Value [Member]    
Loans receivable [Abstract]    
Total loans receivable $ 179,874 $ 172,000