v3.26.1
Fair Value Measurements (Investments Measured at Fair Value) (Details) - EBP 004 [Member] - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value $ 27,751,436 $ 25,010,983
Mutual Funds and Money Market Funds [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 26,084,654 23,047,504
First BanCorp. Common Stock [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,320,517 1,018,946
PCRA [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 346,265 944,533
Fair Value, Inputs, Level 1 [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 27,693,611 24,936,076
Fair Value, Inputs, Level 1 [Member] | Mutual Funds and Money Market Funds [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 26,084,654 23,047,504
Fair Value, Inputs, Level 1 [Member] | First BanCorp. Common Stock [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 1,320,517 1,018,946
Fair Value, Inputs, Level 1 [Member] | PCRA [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 288,440 869,626
Fair Value Inputs Level 2 [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 57,825 74,907
Fair Value Inputs Level 2 [Member] | Mutual Funds and Money Market Funds [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Fair Value Inputs Level 2 [Member] | First BanCorp. Common Stock [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Fair Value Inputs Level 2 [Member] | PCRA [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 57,825 74,907
Fair Value Inputs Level 3 [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Fair Value Inputs Level 3 [Member] | Mutual Funds and Money Market Funds [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Fair Value Inputs Level 3 [Member] | First BanCorp. Common Stock [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
Fair Value Inputs Level 3 [Member] | PCRA [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value $ 0 $ 0