v3.26.1
Employee Benefit Plan, Statement of Change in Net Asset Available for Benefit (Statement) - EBP Third Federal 401(k) Savings Plan - USD ($)
3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
EBP, Statement of Change in Net Asset Available for Benefit [Line Items]      
EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash $ 4,417,736 $ 3,003,849  
EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover 5,551,177 4,772,125  
EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover 1,035,509 183,650  
EBP, Change in Net Asset Available for Benefit, Increase from Contribution 11,004,422 7,959,624  
EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment 638,532 581,060  
EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment 2,930,086 2,510,846  
EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment 25,324,615 20,174,170  
EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment 28,893,233 23,266,076  
EBP, Change in Net Asset Available for Benefit, Increase 39,897,655 31,225,700  
EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant 19,553,972 22,660,285  
EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense 236,109 223,052  
EBP, Change in Net Asset Available for Benefit, Decrease 19,790,081 22,883,337  
EBP, Change in Net Asset Available for Benefit, Increase (Decrease) 20,107,574 8,342,363  
EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan 1,014,212 2,198,318  
EBP, Net Asset Available for Benefit $ 225,691,133 $ 204,569,347 $ 194,028,666