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FAIR VALUE - Reconciliation of Fair Value of Assets and Liabilities Measured on Recurring Basis Level 3 (Detail) - Fair Value Inputs Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 11,481 | $ 12,643 | $ 11,977 | $ 14,590
Total gains or (losses) (realized/unrealized): |  |  |  |
Included in other comprehensive income | 191 | 649 | 896 | 1,615
Included in earnings | 9 | 0 | 136 | (1,631)
Sales |  |  | 0 | 0
Principal repayments and amortization | (1,213) | (1,046) | (2,541) | (2,328)
Ending balance | 11,468 | 12,396 | 11,468 | 12,396
Other Debt Securities [Member] |  |  |  |
Total gains or (losses) (realized/unrealized): |  |  |  |
Purchases | 1,000 | 0 | 1,000 | 0
BSPR |  |  |  |
Total gains or (losses) (realized/unrealized): |  |  |  |
Purchases | $ 0 | $ 150 | $ 0 | $ 150

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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