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SECURITIES SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity Securities, FV-NI, Cost |  | $ 1,800 |  |  |
Investment securities available for sale, at fair value |  | 1,900 |  |  |
Proceeds from sales | $ 260,000 | 755,616 | $ 596,758 | $ 457,306 |
Securities pledged as collateral for public funds on deposit | 8,000 | 21,900 | 8,000 |  |
Securities pledged as collateral for individual, trust, and estate deposits | 5,900 | 4,800 | 5,900 |  |
Federal Home Loan Bank Stock, at cost | 23,400 | 30,916 | 23,400 |  |
Pledged securities against specific FHLB advances, fair value | 1,060,000 | 812,200 | 1,060,000 |  |
Loans pledged as collateral | $ 756,000 | 928,800 | 756,000 |  |
Federal Home Loan Bank |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Interest and dividend income from FLHB |  | $ 1,000 | $ 1,100 | $ 500 |
Retained Earnings | Accounting Standards Update 2016-01 |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ 475

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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