FAIR VALUE MEASUREMENTS - Fair value of assets measured on a recurring basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Assets
Mortgage servicing rights	$ 17,484	$ 13,650	$ 13,369
Recurring
Assets
Mortgage servicing rights	17,484	13,650
Recurring \| U.S. Treasury securities
Assets
Securities available for sale	91,460
Recurring \| Obligations of U.S. Government sponsored agencies
Assets
Securities available for sale	154,268	21,279
Recurring \| Obligations of states and political subdivisions
Assets
Securities available for sale	79,716	57,419
Recurring \| Mortgage-backed securities
Assets
Securities available for sale	134,847	70,756
Recurring \| Corporate notes
Assets
Securities available for sale	22,944	14,968
Recurring \| Markets for Identical Assets (Level 1) \| U.S. Treasury securities
Assets
Securities available for sale	91,460
Recurring \| Other Observable Inputs (Level 2)
Assets
Mortgage servicing rights	17,484	13,650
Recurring \| Other Observable Inputs (Level 2) \| Obligations of U.S. Government sponsored agencies
Assets
Securities available for sale	154,268	21,279
Recurring \| Other Observable Inputs (Level 2) \| Obligations of states and political subdivisions
Assets
Securities available for sale	79,716	57,419
Recurring \| Other Observable Inputs (Level 2) \| Mortgage-backed securities
Assets
Securities available for sale	134,847	70,756
Recurring \| Other Observable Inputs (Level 2) \| Corporate notes
Assets
Securities available for sale	22,944	14,968
Recurring \| Significant Unobservable Inputs (Level 3)
Assets
Assets at fair value	0	$ 0
Liabilities
Liabilities at fair value	$ 0