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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Financial assets |  |
Debt securities held to maturity | $ 32,180 | $ 31,425
Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 671,630 | 375,580
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Common equities and mutual funds | 4,207 | 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 | 27,080 | 23,282
Financial liabilities |  |
Deposits | 6,795,322 | 6,583,648
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 1,941 | 247
Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,850,581 | 1,804,228
Debt securities held to maturity | 32,180 | 31,425
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 10,495 | 12,064
Loans held for sale | 69,518 | 77,779
Loans and leases | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 23,694 | 28,210
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 142,292 | 5,417
Other short- and long-term borrowings | 31,421 | 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 | 4,298,218 | 4,223,010
Federal Reserve Bank and Federal Home Loan Bank stocks | 0 | 0
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 0 | 0
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 0 | 0
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 671,630 | 375,580
Debt securities available for sale | 1,850,581 | 1,804,228
Debt securities held to maturity | 35,440 | 36,591
Common equities and mutual funds | 4,207 | 3,378
Non-marketable equity securities | 20,195 | 20,453
Loans held for sale | 69,518 | 77,779
Loans and leases | 4,419,364 | 4,359,681
Federal Reserve Bank and Federal Home Loan Bank stocks | 23,694 | 28,210
Accrued interest receivable | 27,080 | 23,282
Financial liabilities |  |
Deposits | 6,936,055 | 6,589,182
Other short- and long-term borrowings | 33,614 | 33,873
Accrued interest payable | 1,941 | 247
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 671,630 | 375,580
Debt securities available for sale | 1,850,581 | 1,804,228
Debt securities held to maturity | 32,180 | 31,425
Common equities and mutual funds | 4,207 | 3,378
Non-marketable equity securities | 20,195 | 20,453
Loans held for sale | 69,518 | 77,779
Loans and leases | 4,298,218 | 4,223,010
Federal Reserve Bank and Federal Home Loan Bank stocks | 23,694 | 28,210
Accrued interest receivable | 27,080 | 23,282
Financial liabilities |  |
Deposits | 6,937,613 | 6,589,065
Other short- and long-term borrowings | 31,421 | 31,187
Accrued interest payable | $ 1,941 | $ 247

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