v3.26.1
FAIR VALUE MEASUREMENTS - Schedule of Fair Value Hierarchy (Details) - EBP 001 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 244,097,792 $ 225,206,804
WaFd, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 6,303,914 6,887,208
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 223,721,255 199,580,124
Collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 14,072,623 18,739,472
Fair Value, Level 1, Level 2, and Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 230,025,169 206,467,332
Fair Value, Level 1, Level 2, and Level 3 | WaFd, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 6,303,914 6,887,208
Fair Value, Level 1, Level 2, and Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 223,721,255 199,580,124
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 230,025,169 206,467,332
Level 1 | WaFd, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 6,303,914 6,887,208
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 223,721,255 199,580,124
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | WaFd, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | WaFd, Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Net Asset Value | Collective trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 14,072,623 $ 18,739,472