v3.26.1
Employee Benefit Plan, Fair Value and NAV (Tables) - EBP Third Federal 401(k) Savings Plan - USD ($)
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Abstract]    
EBP, Investment, Fair Value and NAV
The following table sets forth by level, within the fair value hierarchy, the Plan's assets at fair value as of December 31, 2025 and 2024. Classification within the fair value hierarchy table is based on the lowest level of any input that is significant to the fair value measurement.
Investments at Fair Value as of December 31, 2025
Level 1Level 2Level 3Total
Registered Investment Companies$81,537,063 $— $— $81,537,063 
Common Stocks14,834,206 — — 14,834,206 
CD Portfolio— 12,792,949 — 12,792,949 
Total Assets in the Fair Value Hierarchy$96,371,269 $12,792,949 $— $109,164,218 
Investments Measured at Net Asset Value— — — 111,813,036 
Total Investments at Fair Value$96,371,269 $12,792,949 $— $220,977,254 
3.     Investments, Continued
Investments at Fair Value as of December 31, 2024
Level 1Level 2Level 3Total
Registered Investment Companies$70,887,863 $— $— $70,887,863 
Common Stocks14,362,161 — — 14,362,161 
CD Portfolio— 13,148,328 — 13,148,328 
Total Assets in the Fair Value Hierarchy$85,250,024 $13,148,328 $— $98,398,352 
Investments Measured at Net Asset Value— — — 101,352,124 
Total Investments at Fair Value$85,250,024 $13,148,328 $— $199,750,476 
The following tables summarize investments for which fair value is measured using the net asset value per share practical expedient as of December 31, 2025 and 2024, respectively. The investment option limits transfer activity. Once the number of allowed transfers is met, participants are not allowed to transfer back into an investment option which they have transferred out of until the holding period lapses (30 or 90 days depending on the investment).
Investments Measured Using the Net Asset Value per Share Practical Expedient at December 31, 2025
Redemption
Frequency
Unfunded(if currentlyRedemption
Fair ValueCommitmentseligible)Notice Period
Pooled Separate Accounts$111,813,036 $— Daily30 days
Investments Measured Using the Net Asset Value per Share Practical Expedient at December 31, 2024
Redemption
Frequency
Unfunded(if currentlyRedemption
Fair ValueCommitmentseligible)Notice Period
Pooled Separate Accounts$101,352,124 $— Daily30 days
  
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value $ 220,977,254 $ 199,750,476
EBP, Investment, Fair Value and NAV
The following table sets forth by level, within the fair value hierarchy, the Plan's assets at fair value as of December 31, 2025 and 2024. Classification within the fair value hierarchy table is based on the lowest level of any input that is significant to the fair value measurement.
Investments at Fair Value as of December 31, 2025
Level 1Level 2Level 3Total
Registered Investment Companies$81,537,063 $— $— $81,537,063 
Common Stocks14,834,206 — — 14,834,206 
CD Portfolio— 12,792,949 — 12,792,949 
Total Assets in the Fair Value Hierarchy$96,371,269 $12,792,949 $— $109,164,218 
Investments Measured at Net Asset Value— — — 111,813,036 
Total Investments at Fair Value$96,371,269 $12,792,949 $— $220,977,254 
3.     Investments, Continued
Investments at Fair Value as of December 31, 2024
Level 1Level 2Level 3Total
Registered Investment Companies$70,887,863 $— $— $70,887,863 
Common Stocks14,362,161 — — 14,362,161 
CD Portfolio— 13,148,328 — 13,148,328 
Total Assets in the Fair Value Hierarchy$85,250,024 $13,148,328 $— $98,398,352 
Investments Measured at Net Asset Value— — — 101,352,124 
Total Investments at Fair Value$85,250,024 $13,148,328 $— $199,750,476 
The following tables summarize investments for which fair value is measured using the net asset value per share practical expedient as of December 31, 2025 and 2024, respectively. The investment option limits transfer activity. Once the number of allowed transfers is met, participants are not allowed to transfer back into an investment option which they have transferred out of until the holding period lapses (30 or 90 days depending on the investment).
Investments Measured Using the Net Asset Value per Share Practical Expedient at December 31, 2025
Redemption
Frequency
Unfunded(if currentlyRedemption
Fair ValueCommitmentseligible)Notice Period
Pooled Separate Accounts$111,813,036 $— Daily30 days
Investments Measured Using the Net Asset Value per Share Practical Expedient at December 31, 2024
Redemption
Frequency
Unfunded(if currentlyRedemption
Fair ValueCommitmentseligible)Notice Period
Pooled Separate Accounts$101,352,124 $— Daily30 days
  
Fair Value, Inputs, Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value $ 96,371,269 85,250,024
Fair Value, Inputs, Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value 12,792,949 13,148,328
Fair Value, Inputs, Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value 0 0
EBP, Pooled Separate Account    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value 111,813,036 101,352,124
EBP, Fair Value, Investment, NAV, Unfunded Commitment 0 0
EBP, Pooled Separate Account | Fair Value, Inputs, Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value 0 0
EBP, Pooled Separate Account | Fair Value, Inputs, Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value 0 0
EBP, Pooled Separate Account | Fair Value, Inputs, Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value 0 0
EBP, Employer, Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
EBP, Investment, Fair Value $ 14,834,206 $ 14,362,161