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SECURITIES - Narrative (Details) | 12 Months Ended | 41 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) security | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of securities in an unrealized loss position | security | 67 |  |  | 67
Securities pledged as collateral for public funds on deposit | $ 0 | $ 0 |  | $ 0
Securities pledged as collateral for individual, trust, and estate deposits | 0 | 0 |  | 0
Equity securities without readily determinable fair value, amount | 16,000,000 | 23,000,000 |  | 16,000,000
Federal reserve bank stock | 19,700,000 | 19,700,000 |  | 19,700,000
Federal Reserve Bank and Federal Home Loan Bank Stock, at cost | 8,700,000 | 7,500,000 |  | 8,700,000
Pledged securities against specific FHLB advances, fair value | 644,700,000 | 673,800,000 |  | 644,700,000
Loans pledged as collateral | 0 | 333,800,000 |  | 0
Impairment recognized | 2,600,000 | 1,300,000 | $ 0 |
Marketable |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Equity securities | 12,700,000 | 3,000,000 |  | 12,700,000
Fair value adjustment |  |  |  | 7,500,000
Unrealized gains (losses) on marketable equity securities | (3,400,000) |  |  | 4,100,000
Non-marketable |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Equity securities | 4,600,000 | 2,800,000 |  | 4,600,000
Unrealized gains (losses) on marketable equity securities | 600,000 | 0 |  |
Asset Pledged as Collateral |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Investments | 236,100,000 | 359,700,000 |  | $ 236,100,000
Federal Home Loan Bank |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Interest and dividend income from FLHB | 200,000 | 800,000 | $ 1,000,000 |
Federal Reserve Bank |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Interest and dividend income from FLHB | $ 1,500,000 | $ 300,000 |  |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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