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Award Timing Disclosure	12 Months Ended
Award Timing Disclosure	Dec. 31, 2025
Award Timing Disclosures [Line Items]
Award Timing MNPI Disclosure	Policies and Practices Related to the Grant of Certain Equity Awards Close in Time to the Release of Material Nonpublic Information Our equity awards are generally granted on fixed dates determined in advance. The Compensation Committee’s general practice is to complete its annual executive compensation review and determine target compensation for the NEOs, which coincides with Columbia Financial’s regularly scheduled Board and Committee meetings, then such equity awards are granted. Annual equity awards are typically granted to our NEOs in March of each fiscal year. On limited occasions, the Compensation Committee may grant equity awards outside of our annual grant cycle for new hires, promotions, recognition, retention, or other purposes. The Compensation Committee approves all equity award grants on or before the grant date and does not grant equity awards in anticipation of the release of material nonpublic information. Similarly, the Compensation Committee does not time the release of material nonpublic information based on equity award grant dates.
Award Timing Method	Our equity awards are generally granted on fixed dates determined in advance. The Compensation Committee’s general practice is to complete its annual executive compensation review and determine target compensation for the NEOs, which coincides with Columbia Financial’s regularly scheduled Board and Committee meetings, then such equity awards are granted. Annual equity awards are typically granted to our NEOs in March of each fiscal year. On limited occasions, the Compensation Committee may grant equity awards outside of our annual grant cycle for new hires, promotions, recognition, retention, or other purposes.
Award Timing Predetermined	true
Award Timing MNPI Considered	false
Award Timing, How MNPI Considered	The Compensation Committee approves all equity award grants on or before the grant date and does not grant equity awards in anticipation of the release of material nonpublic information. Similarly, the Compensation Committee does not time the release of material nonpublic information based on equity award grant dates.
MNPI Disclosure Timed for Compensation Value	false