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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