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FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Financial assets [Abstract] |  |  |
Securities available for sale | $ 1,469,249 | $ 1,256,087 |
Securities held to maturity | 632,574 | 346,847 |
Financial liabilities [Abstract] |  |  |
Capital leases | 0 | 2,259 | $ 0
Trust preferred securities | 10,310 | 10,310 |
Subordinated debentures | 73,211 |  |
Level 1 [Member] |  |  |
Financial assets [Abstract] |  |  |
Cash and cash equivalents | 773,830 | 27,658 |
Securities available for sale | 1,125 | 914 |
Securities held to maturity | 0 | 0 |
Total securities | 1,125 | 914 |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Federal Home Loan Bank stock | 0 | 0 |
Accrued interest receivable | 17,199 | 13,352 |
Financial liabilities [Abstract] |  |  |
Non-interest bearing demand deposits | 2,167,522 | 1,369,672 |
Interest bearing demand deposits, savings, and money markets | 136,568 | 115,204 |
Certificates of deposit | 0 | 0 |
Total deposits | 2,304,090 | 1,484,876 |
Advances from Federal Home Loan Bank | 0 | 0 |
Federal funds purchased | 992,000 | 540,000 |
Securities sold under agreements to repurchase | 0 | 0 |
Capital leases | 0 |  |
Trust preferred securities | 0 | 0 |
Subordinated debentures | 0 |  |
Accrued interest payable | 875 | 272 |
Level 2 [Member] |  |  |
Financial assets [Abstract] |  |  |
Cash and cash equivalents | 0 | 0 |
Securities available for sale | 1,468,124 | 1,255,173 |
Securities held to maturity | 632,574 | 346,847 |
Total securities | 2,100,698 | 1,602,020 |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Federal Home Loan Bank stock | 47,512 | 24,410 |
Accrued interest receivable | 0 | 0 |
Financial liabilities [Abstract] |  |  |
Non-interest bearing demand deposits | 0 | 0 |
Interest bearing demand deposits, savings, and money markets | 0 | 0 |
Certificates of deposit | 125,772 | 91,304 |
Total deposits | 125,772 | 91,304 |
Advances from Federal Home Loan Bank | 108,168 | 8,630 |
Federal funds purchased | 0 | 0 |
Securities sold under agreements to repurchase | 3,039 | 4,007 |
Capital leases | 2,018 |  |
Trust preferred securities | 10,437 | 10,416 |
Subordinated debentures | 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] |  |  |
Impaired Loans, Net | 926,803 | 707,774 |
Federal Home Loan Bank stock | 0 | 0 |
Accrued interest receivable | 0 | 0 |
Financial liabilities [Abstract] |  |  |
Non-interest bearing demand deposits | 0 | 0 |
Interest bearing demand deposits, savings, and money markets | 0 | 0 |
Certificates of deposit | 0 | 0 |
Total deposits | 0 | 0 |
Advances from Federal Home Loan Bank | 0 | 0 |
Federal funds purchased | 0 | 0 |
Securities sold under agreements to repurchase | 0 | 0 |
Capital leases | 0 |  |
Trust preferred securities | 0 | 0 |
Subordinated debentures | 0 |  |
Accrued interest payable | 0 | 0 |
Carrying Amount [Member] |  |  |
Financial assets [Abstract] |  |  |
Cash and cash equivalents | 773,830 | 27,658 |
Securities available for sale | 1,469,249 | 1,256,087 |
Securities held to maturity | 619,853 | 345,743 |
Total securities | 2,089,102 | 1,601,830 |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 925,894 | 713,087 |
Federal Home Loan Bank stock | 47,512 | 24,410 |
Accrued interest receivable | 17,199 | 13,352 |
Financial liabilities [Abstract] |  |  |
Non-interest bearing demand deposits | 2,167,522 | 1,449,101 |
Interest bearing demand deposits, savings, and money markets | 136,568 | 117,262 |
Certificates of deposit | 125,992 | 91,171 |
Total deposits | 2,430,082 | 1,657,534 |
Advances from Federal Home Loan Bank | 107,000 | 7,000 |
Federal funds purchased | 992,000 | 540,000 |
Securities sold under agreements to repurchase | 3,039 | 4,007 |
Capital leases | 2,018 |  |
Trust preferred securities | 10,310 | 10,310 |
Subordinated debentures | 73,211 |  |
Accrued interest payable | 875 | 272 |
Estimated Fair Value [Member] |  |  |
Financial assets [Abstract] |  |  |
Cash and cash equivalents | 773,830 | 27,658 |
Securities available for sale | 1,469,249 | 1,256,087 |
Securities held to maturity | 632,574 | 346,847 |
Total securities | 2,101,823 | 1,602,934 |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 926,803 | 707,774 |
Federal Home Loan Bank stock | 47,512 | 24,410 |
Accrued interest receivable | 17,199 | 13,352 |
Financial liabilities [Abstract] |  |  |
Non-interest bearing demand deposits | 2,167,522 | 1,369,672 |
Interest bearing demand deposits, savings, and money markets | 136,568 | 115,204 |
Certificates of deposit | 125,772 | 91,304 |
Total deposits | 2,429,862 | 1,576,180 |
Advances from Federal Home Loan Bank | 108,168 | 8,630 |
Federal funds purchased | 992,000 | 540,000 |
Securities sold under agreements to repurchase | 3,039 | 4,007 |
Capital leases | 2,018 |  |
Trust preferred securities | 10,437 | 10,416 |
Subordinated debentures | 77,250 |  |
Accrued interest payable | 875 | 272 |
One to Four Family Residential Mortgage Loans [Member] | Level 1 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
One to Four Family Residential Mortgage Loans [Member] | Level 2 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
One to Four Family Residential Mortgage Loans [Member] | Level 3 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 163,886 | 121,385 |
One to Four Family Residential Mortgage Loans [Member] | Carrying Amount [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 162,298 | 125,021 |
One to Four Family Residential Mortgage Loans [Member] | Estimated Fair Value [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 163,886 | 121,385 |
Commercial and Multifamily Real Estate Loans [Member] | Level 1 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Commercial and Multifamily Real Estate Loans [Member] | Level 2 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Commercial and Multifamily Real Estate Loans [Member] | Level 3 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 422,307 | 314,372 |
Commercial and Multifamily Real Estate Loans [Member] | Carrying Amount [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 422,932 | 310,199 |
Commercial and Multifamily Real Estate Loans [Member] | Estimated Fair Value [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 422,307 | 314,372 |
Agricultural Real Estate Loans [Member] | Level 1 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Agricultural Real Estate Loans [Member] | Level 2 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Agricultural Real Estate Loans [Member] | Level 3 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 63,868 | 66,682 |
Agricultural Real Estate Loans [Member] | Carrying Amount [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 63,612 | 64,316 |
Agricultural Real Estate Loans [Member] | Estimated Fair Value [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 63,868 | 66,682 |
Consumer Loans [Member] | Level 1 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Consumer Loans [Member] | Level 2 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Consumer Loans [Member] | Level 3 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 36,738 | 33,504 |
Consumer Loans [Member] | Carrying Amount [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 37,094 | 33,527 |
Consumer Loans [Member] | Estimated Fair Value [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 36,738 | 33,504 |
Commercial Operating [Member] | Level 1 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Commercial Operating [Member] | Level 2 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Commercial Operating [Member] | Level 3 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 31,108 | 23,245 |
Commercial Operating [Member] | Carrying Amount [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 31,271 | 29,893 |
Commercial Operating [Member] | Estimated Fair Value [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 31,108 | 23,245 |
Agricultural Operating Loans [Member] | Level 1 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Agricultural Operating Loans [Member] | Level 2 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Agricultural Operating Loans [Member] | Level 3 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 36,897 | 40,003 |
Agricultural Operating Loans [Member] | Carrying Amount [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 37,083 | 43,626 |
Agricultural Operating Loans [Member] | Estimated Fair Value [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 36,897 | 40,003 |
Premium Finance Loans [Member] | Level 1 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Premium Finance Loans [Member] | Level 2 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 0 | 0 |
Premium Finance Loans [Member] | Level 3 [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 172,000 | 108,583 |
Premium Finance Loans [Member] | Carrying Amount [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | 171,604 | 106,505 |
Premium Finance Loans [Member] | Estimated Fair Value [Member] |  |  |
Loans receivable: [Abstract] |  |  |
Impaired Loans, Net | $ 172,000 | $ 108,583 |

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