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INVESTMENT SECURITIES - Investment Securities Pledged as Collateral (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Investment Securities Pledged as Collateral |  |
Investment securities pledged to collateralize certain deposits and borrowings | $ 2,400.0 | $ 2,320.0
Debt Securities, Pledged Status [Extensible Enumeration] | us-gaap:AssetPledgedAsCollateralWithoutRightMember | us-gaap:AssetPledgedAsCollateralWithoutRightMember
Debt Securities, Pledging Purpose [Extensible Enumeration] | Deposits | Deposits
U.S. Treasury and Agency Securities | Securities Sold under Agreements to Repurchase [Member] |  |
Investment Securities Pledged as Collateral |  |
Investment securities pledged to collateralize certain deposits and borrowings | $ 433.6 | $ 485.4

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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Period Type: | instant

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- Definition Indicates pledged status of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI https://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Indicates pledging purpose of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(ii) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI https://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685 + Details
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- References No definition available. + Details
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- Details
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- Details
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Balance Type: |
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