DEBT SECURITIES - Narrative (Details)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($)	Mar. 31, 2026	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2022 USD ($) fund
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortization expense	$ 0		$ 0	$ 100,000	$ 0
Number of bank technology funds | fund							2
Debt securities pledged as collateral	33,800,000			$ 33,800,000		$ 29,800,000
Shareholder equity held by one issuer (as a percent)		10.00%		10.00%
Proceeds from sale of debt securities				$ 0	$ 0
AFS, accrued interest receivable	82,000			82,000		44,000
HTM, accrued interest receivable	600,000			600,000		400,000
Held-to-maturity debt securities, allowance for credit losses	151,000			151,000		74,000
Bank Technology Fund
Debt Securities, Available-for-sale [Line Items]
Contractual obligation						3,000,000.0	$ 6,000,000.0
Contribution to committed investments				1,300,000		2,200,000
Proceeds from return on investments from partnerships				0		100,000
Balance with SBIC included in other assets	5,800,000			5,800,000		4,500,000
Committed investments to be made in the future				6,100,000
Sale Leaseback Fund
Debt Securities, Available-for-sale [Line Items]
Contractual obligation						3,000,000.0
Small Business Investment Company ("SBIC")
Debt Securities, Available-for-sale [Line Items]
Contractual obligation	500,000			500,000
Contribution to committed investments				0		0
Small Business Investment Company ("SBIC") | Other Assets
Debt Securities, Available-for-sale [Line Items]
Balance with SBIC included in other assets	$ 2,400,000			$ 2,400,000		$ 2,400,000