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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Financial assets |  |
Debt securities held to maturity | $ 27,431 | $ 30,236
Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 597,396 | 158,337
Debt securities available for sale | 0 | 0
Debt securities held to maturity | 0 | 0
Common equities and mutual funds | 3,563 | 3,303
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 | 35,279 | 31,385
Financial liabilities |  |
Deposits | 6,514,740 | 5,845,879
Overnight federal funds purchased |  | 377,000
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 771 | 571
Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Debt securities available for sale | 1,480,090 | 1,741,221
Debt securities held to maturity | 27,431 | 30,236
Common equities and mutual funds | 0 | 0
Non-marketable equity securities | 9,699 | 9,522
Loans held for sale | 72,648 | 688,870
Loans and leases | 0 | 0
Federal Reserve Bank and Federal Home Loan Bank stocks | 24,454 | 36,014
Accrued interest receivable | 0 | 0
Financial liabilities |  |
Deposits | 4,112 | 29,115
Overnight federal funds purchased |  | 0
Other short- and long-term borrowings | 32,332 | 31,787
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 | 4,501,798 | 4,036,490
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
Other short- and long-term borrowings | 0 | 0
Accrued interest payable | 0 | 0
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 597,396 | 158,337
Debt securities available for sale | 1,480,090 | 1,741,221
Debt securities held to maturity | 32,001 | 33,092
Common equities and mutual funds | 3,563 | 3,303
Non-marketable equity securities | 21,569 | 21,350
Loans held for sale | 72,648 | 688,870
Loans and leases | 4,565,947 | 4,071,071
Federal Reserve Bank and Federal Home Loan Bank stocks | 24,454 | 36,014
Accrued interest receivable | 35,279 | 31,385
Financial liabilities |  |
Deposits | 6,518,953 | 5,875,085
Overnight federal funds purchased |  | 377,000
Other short- and long-term borrowings | 33,380 | 33,354
Accrued interest payable | 771 | 571
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 597,396 | 158,337
Debt securities available for sale | 1,480,090 | 1,741,221
Debt securities held to maturity | 27,431 | 30,236
Common equities and mutual funds | 3,563 | 3,303
Non-marketable equity securities | 21,569 | 21,350
Loans held for sale | 72,648 | 688,870
Loans and leases | 4,501,798 | 4,036,490
Federal Reserve Bank and Federal Home Loan Bank stocks | 24,454 | 36,014
Accrued interest receivable | 35,279 | 31,385
Financial liabilities |  |
Deposits | 6,518,852 | 5,874,994
Overnight federal funds purchased |  | 377,000
Other short- and long-term borrowings | 32,332 | 31,787
Accrued interest payable | $ 771 | $ 571

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