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Stock-Based Compensation - Narrative (Details)
 12 Months Ended
Jun. 02, 2025
USD ($)
director
$ / shares
shares
May 31, 2024
USD ($)
director
$ / shares
shares
Jun. 01, 2023
USD ($)
director
$ / shares
shares
Jan. 01, 2023
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense         $ 3,400,000 $ 4,300,000 $ 4,600,000
Stock-based compensation tax benefit         800,000 1,000,000.0 1,100,000
Fair value, vested in period         4,400,000 5,000,000.0 2,200,000
Grand South              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock portion, number of First Bancorp's stock for each share of acquiree common stock converted (in shares) | shares       0.91      
Non-Employee Director Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of directors | director 9 13 14        
Director equity grants granted, value         $ 37,500 $ 37,500 $ 37,500
Granted during the period (in shares) | shares 8,307 15,457 17,094        
Granted during the period, per director (in shares) | shares 923 1,189 1,221        
Granted during the period (in usd per share) | $ / shares $ 40.63 $ 31.55 $ 30.69        
Director equity grants. expense $ 337,500 $ 487,500 $ 525,000        
Long-Term Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted during the period (in shares) | shares         91,723 67,900 143,380
Granted during the period (in usd per share) | $ / shares         $ 42.06 $ 38.14 $ 37.08
Unrecognized compensation expense         $ 3,600,000    
Unrecognized compensation expense, period for recognition         2 years 1 month 6 days    
Long-Term Restricted Stock | Next Twelve Months              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation expense         $ 1,800,000    
Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation expense         $ 0    
Expiration period         10 years    
First Bancorp 2014 Equity Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares remaining available for grant (in shares) | shares         1,826,655