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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

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