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INVESTMENT SECURITIES - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for credit losses for debt securities | $ 0 |  |
Securities available-for-sale portfolio | security | 119 | 103 |
Securities in unrealized loss position | security | 46 | 50 |
Other than temporary impairment loss | $ 0 | $ 0 |
Other than temporary impairment losses | 0 | 0 | $ 731,000
Available-for-sale Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest receivable | 4,700,000 | 4,500,000 |
Collateral |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities available-for-sale, pledged | $ 28,900,000 | $ 43,700,000 |

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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