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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 02, 2025
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Operating Loss Carryforwards [Line Items]        
Net gains on sales of securities available for sale   $ (38,900) $ (37,700) $ 936
Deferred Tax Assets, Tax Credit Carryforwards     8,642 48
Operating loss carryforwards, annual limitation     2,700  
Internal Revenue Service (IRS)        
Operating Loss Carryforwards [Line Items]        
Operating Loss Carryforwards     23,771 4,507
Operating loss carryforwards, annual limitation     3,337 $ 646
Internal Revenue Service (IRS) | Ownership Change | Territorial Bancorp Inc.        
Operating Loss Carryforwards [Line Items]        
Operating Loss Carryforwards $ 19,900   $ 118,700  
Net gains on sales of securities available for sale $ (121,400)