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SECURITIES SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities held to maturity | $ (164,304) | $ (164,304) | $ (449,840) |  |
Mortgage-backed securities held to maturity | (7,850) | (7,850) | (113,689) |  |
Proceeds from sale of lower-yielding AFS securities | 260,000 | 596,758 | 457,306 | $ 285,508 |
Securities pledged as collateral for public funds on deposit | 8,000 | 8,000 | 5,700 |  |
Securities pledged as collateral for individual, trust, and estate deposits | 5,900 | 5,900 | 3,800 |  |
Federal Home Loan Bank stock, at cost | 23,400 | 23,400 | 61,123 |  |
Pledged securities against specific FHLB advances, fair value | 1,060,000 | 1,060,000 | 1,070,000 |  |
Loans pledged as collateral | 756,000 | 756,000 | 628,000 |  |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities held to maturity | $ 40,900 | 40,900 |  |  | $ 204,700
Mortgage-backed securities held to maturity |  |  |  |  | $ 101,300
Federal Home Loan Bank [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Interest and dividend income from FLHB |  | $ 1,100 | $ 500 | $ 600 |

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- Definition Fair value of financial instrument held by the entity for its own account that are carried at fair value and pledged to as collateral for individual, trust, and estate deposits. + References No definition available. + Details
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- Definition Fair value of financial instrument held by the entity for its own account that are carried at fair value and pledged to counterparties as collateral for public funds on deposit. + References No definition available. + 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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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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