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v3.23.3

SECURITIES - Narrative (Details) | 12 Months Ended
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Sep. 30, 2023 USD ($) security | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of securities in an unrealized loss position | security | 206 |  |
Securities pledged as collateral for public funds on deposit | $ 0 | $ 0 |
Securities pledged as collateral for individual, trust, and estate deposits | 0 | 0 |
Equity securities without readily determinable fair value, amount | 16,200,000 | 18,200,000 |
Federal reserve bank stock | 19,700,000 | 19,700,000 |
Federal Reserve Bank and Federal Home Loan Bank Stock, at cost | 8,500,000 | 9,100,000 |
Loans | 4,316,411,000 | 3,490,358,000 |
Impairment recognized | 3,300,000 | 0 | $ 2,600,000
Estimated Fair Value |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Loans and leases | 4,223,010,000 | 3,525,803,000 |
Marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 3,400,000 | 2,900,000 |
Non-marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 8,400,000 | 7,200,000 |
Unrealized gains (losses) on marketable equity securities | (200,000) | 1,100,000 |
Realized gains (loss) on marketable equity securities | $ 100,000 |  |
Number of Equity Securities Sold | security | 2 |  |
Asset Pledged as Collateral |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investments | $ 773,600,000 | 924,200,000 |
Loans | 21,300,000 | 0 |
Asset Pledged as Collateral with Right | Estimated Fair Value | Federal Home Loan Bank Advances [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Loans and leases | 996,900,000 | 804,000,000 |
Federal Home Loan Bank |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest and dividend income from FLHB | 500,000 | 300,000 | 200,000
Federal Reserve Bank |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest and dividend income from FLHB | $ 1,200,000 | $ 1,200,000 | $ 1,500,000

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