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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Financial assets [Abstract] |  |
Securities available for sale | $ 1,927,537 | $ 1,693,431
Securities held to maturity | 214,158 | 564,185
Financial liabilities [Abstract] |  |
Long-term debt | 85,580 | 85,533
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 71,276 | 1,267,586
Securities available for sale | 1,896 | 1,445
Securities held to maturity | 0 | 0
Total securities | 1,896 | 1,445
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 17,825 | 19,380
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,637,987 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 205,536 | 169,557
Certificates of deposit | 0 | 0
Deposits, Wholesale, Non-Maturing | 74,061 | 18,245
Deposits, Wholesale, Certificates of Deposit | 0 | 0
Total deposits | 2,917,584 | 2,641,859
Advances from Federal Home Loan Bank |  | 0
Federal Funds Purchased | 24,000 |
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 | 3,705 | 2,280
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Securities available for sale | 1,925,641 | 1,691,986
Securities held to maturity | 214,158 | 564,185
Total securities | 2,139,799 | 2,256,171
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Federal Home Loan Bank stock | 7,446 | 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 | 56,381 | 123,094
Deposits, Wholesale, Non-Maturing | 0 | 0
Deposits, Wholesale, Certificates of Deposit | 546,155 | 457,509
Total deposits | 602,536 | 580,603
Advances from Federal Home Loan Bank |  | 415,003
Federal Funds Purchased | 0 |
Federal fund purchased |  | 0
Securities sold under agreements to repurchase | 3,226 | 2,472
Long-term debt | 1,892 | 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 | 1,602,465 | 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 | 71,276 | 1,267,586
Securities available for sale | 1,927,537 | 1,693,431
Securities held to maturity | 224,378 | 563,529
Total securities | 2,151,915 | 2,256,960
Loans receivable [Abstract] |  |
Total loans receivable | 1,599,175 | 1,326,832
Federal Home Loan Bank stock | 7,446 | 61,123
Accrued interest receivable | 17,825 | 19,380
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,637,987 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 205,536 | 169,557
Certificates of deposit | 57,151 | 123,637
Deposits, Wholesale, Non-Maturing | 74,061 | 18,245
Deposits, Wholesale, Certificates of Deposit | 546,898 | 457,928
Total deposits | 3,521,633 | 3,223,424
Advances from Federal Home Loan Bank |  | 415,000
Federal Funds Purchased | 24,000 |
Federal fund purchased |  | 987,000
Securities sold under agreements to repurchase | 3,226 | 2,472
Long-term debt | 1,892 | 1,938
Trust Preferred Securities | 10,310 | 10,310
Subordinated debentures | 73,442 | 73,347
Accrued interest payable | 3,705 | 2,280
Estimated Fair Value [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 71,276 | 1,267,586
Securities available for sale | 1,927,537 | 1,693,431
Securities held to maturity | 214,158 | 564,185
Total securities | 2,141,695 | 2,257,616
Loans receivable [Abstract] |  |
Total loans receivable | 1,602,465 | 1,318,402
Federal Home Loan Bank stock | 7,446 | 61,123
Accrued interest receivable | 17,825 | 19,380
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,637,987 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 205,536 | 169,557
Certificates of deposit | 56,381 | 123,094
Deposits, Wholesale, Non-Maturing | 74,061 | 18,245
Deposits, Wholesale, Certificates of Deposit | 546,155 | 457,509
Total deposits | 3,520,120 | 3,222,462
Advances from Federal Home Loan Bank |  | 415,003
Federal Funds Purchased | 24,000 |
Federal fund purchased |  | 987,000
Securities sold under agreements to repurchase | 3,226 | 2,472
Long-term debt | 1,892 | 1,938
Trust Preferred Securities | 10,464 | 10,447
Subordinated debentures | 75,188 | 76,500
Accrued interest payable | 3,705 | 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 | 213,285 | 196,970
1-4 Family Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 214,754 | 196,706
1-4 Family Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 213,285 | 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 | 706,662 | 576,330
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 716,495 | 585,510
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 706,662 | 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 | 34,821 | 61,584
Agricultural Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 35,475 | 61,800
Agricultural Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 34,821 | 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 | 274,871 | 163,961
Consumer [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 258,158 | 163,004
Consumer [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 274,871 | 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 | 45,505 | 35,723
Commercial Operating [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 46,069 | 35,759
Commercial Operating [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 45,505 | 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 | 24,423 | 32,870
Agricultural Operating [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 24,621 | 33,594
Agricultural Operating [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 24,423 | 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 | 302,898 | 250,964
Commercial Insurance Premium Finance [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 303,603 | 250,459
Commercial Insurance Premium Finance [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | $ 302,898 | $ 250,964

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