v3.26.1
Fair Value Measurements (Investments Measured at Fair Value) (Details) - EBP 002 [Member] - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value $ 185,204,574 $ 157,872,834
Mutual Funds and Money Market Funds [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 179,333,706 151,942,286
First BanCorp. Common Stock [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 5,827,990 5,530,724
PCRA [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 42,878 399,824
Fair Value, Inputs, Level 1 [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 185,204,574 157,872,834
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 179,333,706 151,942,286
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 5,827,990 5,530,724
Fair Value, Inputs, Level 1 [Member] | PCRA [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 42,878 399,824
Fair Value Inputs Level 2 [Member]    
Employee Benefit Plan, Investment, Fair Value and NAV [Line Items]    
Investments at fair value 0 0
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 0 0
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