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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - Significant Unobservable Inputs (Level 3) - U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 941 | $ 16,685 | $ 945 | $ 19,233
Total gains (losses) (realized/unrealized): |  |  |  |
Included in earnings—fair value adjustment | 57 | 18 | 57 | (1,351)
Sales, settlements, and other | (3) | (15,320) | (7) | (16,499)
Balance at end of period | $ 995 | $ 1,383 | $ 995 | $ 1,383

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- Definition Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Fair Value Adjustment Including in Earnings + References No definition available. + Details
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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales and Settlements + References No definition available. + Details
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- Definition Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Total Gains (Losses) [Abstract] + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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