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SECURITIES - Held-to-maturity Debt Securities with Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Less than 12 Months |  |
Fair Value | $ 0 | $ 167,688
Unrealized Loss | 0 | (12,316)
12 Months or More |  |
Fair Value | 352,069 | 199,700
Unrealized Loss | (39,232) | (25,061)
Fair Value | 352,069 | 367,388
Unrealized Loss | (39,232) | (37,377)
Credit related impairment | 0 | 0
U.S. Government sponsored entities |  |
Less than 12 Months |  |
Fair Value | 0 | 143,556
Unrealized Loss | 0 | (10,063)
12 Months or More |  |
Fair Value | 276,243 | 136,879
Unrealized Loss | (26,628) | (17,213)
Fair Value | 276,243 | 280,435
Unrealized Loss | (26,628) | (27,276)
Residential & multi-family mortgage |  |
Less than 12 Months |  |
Fair Value | 0 | 24,132
Unrealized Loss | 0 | (2,253)
12 Months or More |  |
Fair Value | 75,826 | 62,821
Unrealized Loss | (12,604) | (7,848)
Fair Value | 75,826 | 86,953
Unrealized Loss | $ (12,604) | $ (10,101)

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- Definition Debt Securities, Held-to-maturity, Unrealized Loss Position Less Than 12 Months [Abstract] + References No definition available. + Details
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- Definition Debt Securities, Held-to-maturity, Unrealized Loss Position More Than 12 Months [Abstract] + References No definition available. + Details
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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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