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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

Principal repayments during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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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
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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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-Publisher FASB
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-SubTopic 10
-Section 50
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Amount of purchases 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.

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Amount of sale 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.

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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.

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