DEBT SECURITIES - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2022 USD ($) fund
Debt Securities, Available-for-sale [Line Items]
Number of bank technology funds | fund				2
Debt securities pledged as collateral	$ 32,200,000		$ 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	39,000		$ 44,000
HTM, accrued interest receivable	500,000		400,000
Held-to-maturity debt securities, allowance for credit losses	83,000		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	400,000		2,200,000
Return of capital, received	0		100,000
Balance with SBIC included in other assets	4,900,000		4,500,000
Committed investments to be made in the future	7,000,000.0
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
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