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LOANS, ALLOWANCE FOR CREDIT LOSSES, AND CREDIT QUALITY - Provisions for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Provision for credit losses on:
Loans	$ 200	$ 4,092	$ 4,292
Unfunded commitments		90	390
Total provision for credit losses	200	$ 4,182	4,682
Other liabilities
Loans
Reserve for unfunded commitments	$ 3,800		$ 3,800

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- Definition

Amount of expense related to credit loss from unfunded commitments.

+ References

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Amount of allowance for credit loss on unfunded commitments.

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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-Publisher SEC

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of credit loss expense (reversal of expense) for financing receivable.

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