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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Financial assets [Abstract] |  |
Securities available for sale | $ 1,992,352 | $ 1,693,431
Securities held to maturity | 240,144 | 564,185
Financial liabilities [Abstract] |  |
Long-term debt | 85,552 | 85,533
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 1,300,409 | 1,267,586
Securities available for sale | 1,829 | 1,445
Securities held to maturity | 0 | 0
Total securities | 1,829 | 1,445
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 21,089 | 19,380
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,779,645 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 185,376 | 169,557
Certificates of deposit | 0 | 0
Deposits, Wholesale, Non-Maturing | 40,928 | 18,245
Deposits, Wholesale, Certificates of Deposit | 0 | 0
Total deposits | 3,005,949 | 2,641,859
Advances from Federal Home Loan Bank | 0 | 0
Federal Funds Purchased | 1,100,000 |
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 | 4,065 | 2,280
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Securities available for sale | 1,990,523 | 1,691,986
Securities held to maturity | 240,144 | 564,185
Total securities | 2,230,667 | 2,256,171
Loans receivable [Abstract] |  |
Total loans receivable | 0 | 0
Federal Home Loan Bank stock | 57,443 | 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 | 127,451 | 123,094
Deposits, Wholesale, Non-Maturing | 0 | 0
Deposits, Wholesale, Certificates of Deposit | 379,101 | 457,509
Total deposits | 506,552 | 580,603
Advances from Federal Home Loan Bank | 210,002 | 415,003
Federal Funds Purchased | 0 |
Federal fund purchased |  | 0
Securities sold under agreements to repurchase | 3,339 | 2,472
Long-term debt | 1,922 | 1,938
Trust Preferred Securities | 10,445 | 10,447
Subordinated debentures | 75,750 | 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 | 1,532,835 | 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 | 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 | 1,300,409 | 1,267,586
Securities available for sale | 1,992,352 | 1,693,431
Securities held to maturity | 243,492 | 563,529
Total securities | 2,235,844 | 2,256,960
Loans receivable [Abstract] |  |
Total loans receivable | 1,511,163 | 1,326,832
Federal Home Loan Bank stock | 57,443 | 61,123
Accrued interest receivable | 21,089 | 19,380
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,779,645 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 185,376 | 169,557
Certificates of deposit | 128,220 | 123,637
Deposits, Wholesale, Non-Maturing | 40,928 | 18,245
Deposits, Wholesale, Certificates of Deposit | 379,476 | 457,928
Total deposits | 3,513,645 | 3,223,424
Advances from Federal Home Loan Bank | 210,000 | 415,000
Federal Funds Purchased | 1,100,000 |
Federal fund purchased |  | 987,000
Securities sold under agreements to repurchase | 3,339 | 2,472
Long-term debt | 1,922 | 1,938
Trust Preferred Securities | 10,310 | 10,310
Subordinated debentures | 73,382 | 73,347
Accrued interest payable | 4,065 | 2,280
Estimated Fair Value [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 1,300,409 | 1,267,586
Securities available for sale | 1,992,352 | 1,693,431
Securities held to maturity | 240,144 | 564,185
Total securities | 2,232,496 | 2,257,616
Loans receivable [Abstract] |  |
Total loans receivable | 1,532,835 | 1,318,402
Federal Home Loan Bank stock | 57,443 | 61,123
Accrued interest receivable | 21,089 | 19,380
Financial liabilities [Abstract] |  |
Noninterest bearing demand deposits | 2,779,645 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 185,376 | 169,557
Certificates of deposit | 127,451 | 123,094
Deposits, Wholesale, Non-Maturing | 40,928 | 18,245
Deposits, Wholesale, Certificates of Deposit | 379,101 | 457,509
Total deposits | 3,512,501 | 3,222,462
Advances from Federal Home Loan Bank | 210,002 | 415,003
Federal Funds Purchased | 1,100,000 |
Federal fund purchased |  | 987,000
Securities sold under agreements to repurchase | 3,339 | 2,472
Long-term debt | 1,922 | 1,938
Trust Preferred Securities | 10,445 | 10,447
Subordinated debentures | 75,750 | 76,500
Accrued interest payable | 4,065 | 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 | 205,413 | 196,970
1-4 Family Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 203,967 | 196,706
1-4 Family Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 205,413 | 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 | 655,777 | 576,330
Commercial and Multi-family Real Estate Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 654,029 | 585,510
Commercial and Multi-family Real Estate Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 655,777 | 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 | 61,257 | 61,584
Agricultural Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 61,303 | 61,800
Agricultural Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 61,257 | 61,584
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 | 293,832 | 163,961
Consumer Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 274,981 | 163,004
Consumer Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 293,832 | 163,961
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 | 56,520 | 35,723
Commercial Operating Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 56,516 | 35,759
Commercial Operating Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 56,520 | 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 | 24,506 | 32,870
Agricultural Operating [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 24,696 | 33,594
Agricultural Operating [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 24,506 | 32,870
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 | 235,530 | 250,964
Premium Finance Loans [Member] | Carrying Amount [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | 235,671 | 250,459
Premium Finance Loans [Member] | Estimated Fair Value [Member] |  |
Loans receivable [Abstract] |  |
Total loans receivable | $ 235,530 | $ 250,964

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