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FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Financial assets [Abstract] |  |
Securities available for sale | $ 1,852,025 | $ 1,693,431
Securities held to maturity | 160,974 | 564,185
Loans held for sale | 15,606 | 0
Financial liabilities [Abstract] |  |
Trust preferred securities | 13,661 | 10,310
Subordinated debentures | 73,491 |
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 99,977 | 1,267,586
Securities available for sale | 3,800 | 1,445
Securities held to maturity | 0 | 0
Total securities | 3,800 | 1,445
Loans held for sale | 0 |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 22,016 | 19,380
Financial liabilities [Abstract] |  |
Non-interest bearing demand deposits | 2,405,274 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 218,347 | 169,557
Certificates of deposits | 0 | 0
Wholesale non-maturing deposits | 94,384 | 18,245
Wholesale certificates of deposits | 0 | 0
Total deposits | 2,718,005 | 2,641,859
Advances from Federal Home Loan Bank | 0 | 0
Federal funds purchased | 422,000 | 987,000
Securities sold under agreements to repurchase | 0 | 0
Capital leases | 0 | 0
Trust preferred securities | 0 | 0
Subordinated debentures | 0 | 0
Accrued interest payable | 7,794 | 2,280
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Securities available for sale | 1,848,225 | 1,691,986
Securities held to maturity | 160,974 | 564,185
Total securities | 2,009,199 | 2,256,171
Loans held for sale | 15,606 |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Federal Home Loan Bank stock | 23,400 | 61,123
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 deposits | 273,800 | 123,094
Wholesale non-maturing deposits | 0 | 0
Wholesale certificates of deposits | 1,432,146 | 457,509
Total deposits | 1,705,946 | 580,603
Advances from Federal Home Loan Bank | 0 | 415,003
Federal funds purchased | 0 | 0
Securities sold under agreements to repurchase | 3,694 | 2,472
Capital leases | 1,876 | 1,938
Trust preferred securities | 13,866 | 10,447
Subordinated debentures | 75,563 | 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 held for sale | 0 |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 2,927,755 | 1,318,402
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 deposits | 0 | 0
Wholesale non-maturing deposits | 0 | 0
Wholesale certificates of deposits | 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 | 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 | 99,977 | 1,267,586
Securities available for sale | 1,852,025 | 1,693,431
Securities held to maturity | 172,154 | 563,529
Total securities | 2,024,179 | 2,256,960
Loans held for sale | 15,606 |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 2,944,989 | 1,326,832
Federal Home Loan Bank stock | 23,400 | 61,123
Accrued interest receivable | 22,016 | 19,380
Financial liabilities [Abstract] |  |
Non-interest bearing demand deposits | 2,405,274 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 218,347 | 169,557
Certificates of deposits | 276,180 | 123,637
Wholesale non-maturing deposits | 94,384 | 18,245
Wholesale certificates of deposits | 1,436,802 | 457,928
Total deposits | 4,430,987 | 3,223,424
Advances from Federal Home Loan Bank | 0 | 415,000
Federal funds purchased | 422,000 | 987,000
Securities sold under agreements to repurchase | 3,694 | 2,472
Capital leases | 1,876 | 1,938
Trust preferred securities | 13,661 | 10,310
Subordinated debentures | 73,491 | 73,347
Accrued interest payable | 7,794 | 2,280
Estimated Fair Value [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 99,977 | 1,267,586
Securities available for sale | 1,852,025 | 1,693,431
Securities held to maturity | 160,974 | 564,185
Total securities | 2,012,999 | 2,257,616
Loans held for sale | 15,606 |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 2,927,755 | 1,318,402
Federal Home Loan Bank stock | 23,400 | 61,123
Accrued interest receivable | 22,016 | 19,380
Financial liabilities [Abstract] |  |
Non-interest bearing demand deposits | 2,405,274 | 2,454,057
Interest bearing demand deposits, savings, and money markets | 218,347 | 169,557
Certificates of deposits | 273,800 | 123,094
Wholesale non-maturing deposits | 94,384 | 18,245
Wholesale certificates of deposits | 1,432,146 | 457,509
Total deposits | 4,423,951 | 3,222,462
Advances from Federal Home Loan Bank | 0 | 415,003
Federal funds purchased | 422,000 | 987,000
Securities sold under agreements to repurchase | 3,694 | 2,472
Capital leases | 1,876 | 1,938
Trust preferred securities | 13,866 | 10,447
Subordinated debentures | 75,563 | 76,500
Accrued interest payable | 7,794 | 2,280
National Lending [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,850,973 | 397,963
National Lending [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,846,283 | 395,729
National Lending [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,850,973 | 397,963
National Lending [Member] | Commercial Operating [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Commercial Operating [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Commercial Operating [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,506,969 | 255,813
National Lending [Member] | Commercial Operating [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,509,849 | 255,308
National Lending [Member] | Commercial Operating [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,506,969 | 255,813
National Lending [Member] | Consumer [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Consumer [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Consumer [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 342,931 | 141,958
National Lending [Member] | Consumer [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 335,361 | 140,229
National Lending [Member] | Consumer [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 342,931 | 141,958
National Lending [Member] | Tax Services [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Tax Services [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
National Lending [Member] | Tax Services [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,073 | 192
National Lending [Member] | Tax Services [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,073 | 192
National Lending [Member] | Tax Services [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,073 | 192
Community Banking [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,076,782 | 920,439
Community Banking [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,098,706 | 931,103
Community Banking [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 1,076,782 | 920,439
Community Banking [Member] | Commercial Operating [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Commercial Operating [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Commercial Operating [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 41,912 | 30,682
Community Banking [Member] | Commercial Operating [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 42,311 | 30,718
Community Banking [Member] | Commercial Operating [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 41,912 | 30,682
Community Banking [Member] | Consumer [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Consumer [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Consumer [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 24,033 | 22,003
Community Banking [Member] | Consumer [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 23,836 | 22,775
Community Banking [Member] | Consumer [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 24,033 | 22,003
Community Banking [Member] | Commercial and Multi-Family Real Estate [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Commercial and Multi-Family Real Estate [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Commercial and Multi-Family Real Estate [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 731,291 | 576,330
Community Banking [Member] | Commercial and Multi-Family Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 748,579 | 585,510
Community Banking [Member] | Commercial and Multi-Family Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 731,291 | 576,330
Community Banking [Member] | 1-4 Family Real Estate [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | 1-4 Family Real Estate [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | 1-4 Family Real Estate [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 220,697 | 196,970
Community Banking [Member] | 1-4 Family Real Estate [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 223,482 | 196,706
Community Banking [Member] | 1-4 Family Real Estate [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 220,697 | 196,970
Community Banking [Member] | Agricultural [Member] | Level 1 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Agricultural [Member] | Level 2 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Community Banking [Member] | Agricultural [Member] | Level 3 [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 58,849 | 94,454
Community Banking [Member] | Agricultural [Member] | Carrying Amount [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 60,498 | 95,394
Community Banking [Member] | Agricultural [Member] | Estimated Fair Value [Member] |  |
Loans receivable: [Abstract] |  |
Impaired Loans, Net | $ 58,849 | $ 94,454

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- Definition Amount, after allowance for bad debt, of trade and loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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