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FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Financial assets |  |
Debt securities held to maturity | $ 31,425 | $ 38,171
Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 375,580 | 388,038
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Common equities and mutual funds | 3,378 | 2,874
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 | 23,282 | 17,979
Financial liabilities |  |
Deposits | 6,583,648 | 5,858,283
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 247 | 192
Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,804,228 | 1,882,869
Debt securities held to maturity | 31,425 | 38,171
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 12,064 | 15,314
Loans held for sale | 77,779 | 21,071
Loans and leases | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 28,210 | 28,812
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 5,417 | 7,571
Other short- and long-term borrowings | 31,187 | 35,986
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 | 4,223,010 | 3,525,803
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 | 375,580 | 388,038
Debt securities available for sale | 1,804,228 | 1,882,869
Debt securities held to maturity | 36,591 | 41,682
Common equities and mutual funds | 3,378 | 2,874
Non-marketable equity securities | 20,453 | 22,526
Loans held for sale | 77,779 | 21,071
Loans and leases | 4,359,681 | 3,529,280
Federal Reserve Bank and Federal Home Loan Bank stocks | 28,210 | 28,812
Accrued interest receivable | 23,282 | 17,979
Financial liabilities |  |
Deposits | 6,589,182 | 5,866,037
Other short- and long-term borrowings | 33,873 | 36,028
Accrued interest payable | 247 | 192
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 375,580 | 388,038
Debt securities available for sale | 1,804,228 | 1,882,869
Debt securities held to maturity | 31,425 | 38,171
Common equities and mutual funds | 3,378 | 2,874
Non-marketable equity securities | 20,453 | 22,526
Loans held for sale | 77,779 | 21,071
Loans and leases | 4,223,010 | 3,525,803
Federal Reserve Bank and Federal Home Loan Bank stocks | 28,210 | 28,812
Accrued interest receivable | 23,282 | 17,979
Financial liabilities |  |
Deposits | 6,589,065 | 5,865,854
Other short- and long-term borrowings | 31,187 | 35,986
Accrued interest payable | $ 247 | $ 192

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