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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Financial assets [Abstract] |  |
Debt securities available for sale | $ 1,195,619 | $ 1,272,493
Debt securities held to maturity | 114,405 | 133,470
Level 1 |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 108,733 | 126,545
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Common equities and mutual funds | 2,899 | 2,606
Non-marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Loans and leases receivable | 0 | 0
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 16,958 | 20,400
Financial liabilities [Abstract] |  |
Deposits | 3,363,025 | 2,920,516
Overnight federal funds purchased | 717,000 | 642,000
Federal Home Loan Bank advances | 0 | 0
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 3,607 | 9,414
Level 2 |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,195,619 | 1,272,493
Debt securities held to maturity | 114,405 | 133,470
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 10,500 | 6,500
Loans held for sale | 13,610 | 148,777
Loans and leases receivable | 0 | 0
Federal Home Loan Bank stock | 29,944 | 30,916
Accrued interest receivable | 0 | 0
Financial liabilities [Abstract] |  |
Deposits | 603,207 | 1,417,994
Overnight federal funds purchased | 0 | 0
Federal Home Loan Bank advances | 112,122 | 110,691
Other short- and long-term borrowings | 100,826 | 113,876
Accrued interest payable | 0 | 0
Level 3 |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Loans and leases receivable | 3,606,603 | 3,622,597
Federal Home Loan Bank stock | 0 | 0
Accrued interest receivable | 0 | 0
Financial liabilities [Abstract] |  |
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 [Abstract] |  |
Cash and cash equivalents | 108,733 | 126,545
Debt securities available for sale | 1,195,619 | 1,272,493
Debt securities held to maturity | 114,857 | 134,764
Common equities and mutual funds | 2,899 | 2,606
Non-marketable equity securities | 13,032 | 8,169
Loans held for sale | 13,610 | 148,777
Loans and leases receivable | 3,610,785 | 3,651,413
Federal Home Loan Bank stock | 29,944 | 30,916
Accrued interest receivable | 16,958 | 20,400
Financial liabilities [Abstract] |  |
Deposits | 3,962,404 | 4,337,005
Overnight federal funds purchased | 717,000 | 642,000
Federal Home Loan Bank advances | 110,000 | 110,000
Other short- and long-term borrowings | 101,353 | 109,857
Accrued interest payable | 3,607 | 9,414
Estimated Fair Value |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 108,733 | 126,545
Debt securities available for sale | 1,195,619 | 1,272,493
Debt securities held to maturity | 114,405 | 133,470
Common equities and mutual funds | 2,899 | 2,606
Non-marketable equity securities | 13,032 | 8,169
Loans held for sale | 13,610 | 148,777
Loans and leases receivable | 3,606,603 | 3,622,597
Federal Home Loan Bank stock | 29,944 | 30,916
Accrued interest receivable | 16,958 | 20,400
Financial liabilities [Abstract] |  |
Deposits | 3,966,232 | 4,338,510
Overnight federal funds purchased | 717,000 | 642,000
Federal Home Loan Bank advances | 112,122 | 110,691
Other short- and long-term borrowings | 100,826 | 113,876
Accrued interest payable | $ 3,607 | $ 9,414

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