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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Allowance for unfunded commitments	$ 1,800,000	$ 2,200,000
Asset Pledged as Collateral | Federal Home Loan Bank Advances
Loss Contingencies [Line Items]
Letters of credit outstanding	135,000,000
Loss Sharing Relationship
Loss Contingencies [Line Items]
Reserve liability related to multifamily DUS Program	500,000	600,000
Multifamily | Loss Sharing Relationship
Loss Contingencies [Line Items]
UPB of loans sold through DUS	1,800,000,000	1,800,000,000
Loss incurred - related to DUS	0	0	$ 0
Investment commitment
Loss Contingencies [Line Items]
Investment in qualifying small businesses	$ 10,700,000	$ 11,800,000

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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