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FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Financial assets |  |
Debt securities available for sale | $ 1,268,102 | $ 1,272,493
Debt securities held to maturity | 93,745 | 133,470
Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 427,367 | 126,545
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Investment securities available for sale, at fair value | 2,969 | 2,606
Non-marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 0 | 0
Accrued interest receivable | 16,628 | 20,400
Financial liabilities |  |
Deposits | 4,705,028 | 2,920,516
Overnight federal funds purchased | 0 | 642,000
Federal Home Loan Bank advances | 0 | 0
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 1,923 | 9,414
Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,268,102 | 1,272,493
Debt securities held to maturity | 93,745 | 133,470
Investment securities available for sale, at fair value | 0 | 0
Non-marketable equity securities | 12,000 | 6,500
Loans held for sale | 183,577 | 148,777
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 27,138 | 30,916
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 275,045 | 1,417,994
Overnight federal funds purchased | 0 | 0
Federal Home Loan Bank advances | 0 | 110,691
Other short- and long-term borrowings | 100,185 | 113,876
Accrued interest payable | 0 | 0
Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Investment securities available for sale, at fair value | 0 | 0
Non-marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 3,307,037 | 3,622,597
Federal Reserve Bank and Federal Home Loan Bank stocks | 0 | 0
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Overnight federal funds purchased | 0 | 0
Federal Home Loan Bank advances | 0 | 0
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 0 | 0
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 427,367 | 126,545
Debt securities available for sale | 1,268,102 | 1,272,493
Debt securities held to maturity | 92,610 | 134,764
Investment securities available for sale, at fair value | 2,969 | 2,606
Non-marketable equity securities | 14,784 | 8,169
Loans held for sale | 183,577 | 148,777
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 3,314,140 | 3,651,413
Federal Reserve Bank and Federal Home Loan Bank stocks | 27,138 | 30,916
Accrued interest receivable | 16,628 | 20,400
Financial liabilities |  |
Deposits | 4,979,200 | 4,337,005
Overnight federal funds purchased | 0 | 642,000
Federal Home Loan Bank advances | 0 | 110,000
Other short- and long-term borrowings | 98,224 | 109,857
Accrued interest payable | 1,923 | 9,414
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 427,367 | 126,545
Debt securities available for sale | 1,268,102 | 1,272,493
Debt securities held to maturity | 93,745 | 133,470
Investment securities available for sale, at fair value | 2,969 | 2,606
Non-marketable equity securities | 14,784 | 8,169
Loans held for sale | 183,577 | 148,777
Loans receivable: [Abstract] |  |
Impaired Loans, Net | 3,307,037 | 3,622,597
Federal Reserve Bank and Federal Home Loan Bank stocks | 27,138 | 30,916
Accrued interest receivable | 16,628 | 20,400
Financial liabilities |  |
Deposits | 4,980,073 | 4,338,510
Overnight federal funds purchased | 0 | 642,000
Federal Home Loan Bank advances | 0 | 110,691
Other short- and long-term borrowings | 100,185 | 113,876
Accrued interest payable | $ 1,923 | $ 9,414

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