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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) fund	Dec. 31, 2023 USD ($)
Advances from FHLB
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 21,618	$ 22,417
Long-term line of credit	28,865	29,191
Federal reserve borrowings outstanding	0	0
Unsecured Federal Funds Purchased
Debt Instrument [Line Items]
Long-term line of credit	$ 70,000	70,000
Number of unsecured federal funds | fund	2
Unsecured Federal Funds Purchased | Line of Credit
Debt Instrument [Line Items]
Outstanding balances of debt instrument	$ 0	0
Advances from FHLB | Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 442,500	$ 452,280

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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