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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Financial assets |  |
Debt securities held to maturity | $ 31,113 | $ 31,425
Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 347,888 | 375,580
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Common equities and mutual funds | 4,334 | 3,378
Non-marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Loans and leases | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 0 | 0
Accrued interest receivable | 30,294 | 23,282
Financial liabilities |  |
Deposits | 6,267,603 | 6,583,648
Overnight federal funds purchased | 31,000 | 13,000
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 1,961 | 247
Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,779,458 | 1,804,228
Debt securities held to maturity | 31,113 | 31,425
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 10,522 | 12,064
Loans held for sale | 25,946 | 77,779
Loans and leases | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 25,844 | 28,210
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 100,455 | 5,417
Overnight federal funds purchased | 0 | 0
Other short- and long-term borrowings | 31,297 | 31,187
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
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Loans and leases | 4,339,150 | 4,223,010
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
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 0 | 0
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 347,888 | 375,580
Debt securities available for sale | 1,779,458 | 1,804,228
Debt securities held to maturity | 34,682 | 36,591
Common equities and mutual funds | 4,334 | 3,378
Non-marketable equity securities | 20,522 | 20,453
Loans held for sale | 25,946 | 77,779
Loans and leases | 4,402,408 | 4,359,681
Federal Reserve Bank and Federal Home Loan Bank stocks | 25,844 | 28,210
Accrued interest receivable | 30,294 | 23,282
Financial liabilities |  |
Deposits | 6,368,344 | 6,589,182
Overnight federal funds purchased | 31,000 | 13,000
Other short- and long-term borrowings | 33,373 | 33,873
Accrued interest payable | 1,961 | 247
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 347,888 | 375,580
Debt securities available for sale | 1,779,458 | 1,804,228
Debt securities held to maturity | 31,113 | 31,425
Common equities and mutual funds | 4,334 | 3,378
Non-marketable equity securities | 20,522 | 20,453
Loans held for sale | 25,946 | 77,779
Loans and leases | 4,339,150 | 4,223,010
Federal Reserve Bank and Federal Home Loan Bank stocks | 25,844 | 28,210
Accrued interest receivable | 30,294 | 23,282
Financial liabilities |  |
Deposits | 6,368,058 | 6,589,065
Overnight federal funds purchased | 31,000 | 13,000
Other short- and long-term borrowings | 31,297 | 31,187
Accrued interest payable | $ 1,961 | $ 247

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