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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 01, 2023
USD ($)
option
branch
$ / shares
shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Business Combination [Line Items]        
Goodwill   $ 478,750 $ 478,750  
Fair value mark $ 29,500      
Merger and acquisition expenses   0 0 $ 13,695
Provision for loan losses   9,564 18,751 $ 19,750
Unfunded Loan Commitment        
Business Combination [Line Items]        
Provision for loan losses   $ 1,938 $ (2,303)  
Grand South        
Business Combination [Line Items]        
Percentage of voting interest acquired 100.00%      
Common stock portion, number of First Bancorp's stock for each share of acquiree common stock converted (in shares) | shares 0.91      
Number of shares issued (in shares) | shares 5,032,834      
Common stock options converted | option 542,345      
Business acquisition, equity interest issued or issuable, common stock options, converted, exercise price (in dollars per share) | $ / shares $ 20.14      
Total purchase price $ 229,489      
Price per share at acquisition date (in US dollars per share) | $ / shares $ 42.84      
Number banking locations | branch 8      
Goodwill $ 114,487      
Loans reclassified from fair value mark to ACL resulting from PCD loans $ 5,610      
Grand South | Core deposit intangibles        
Business Combination [Line Items]        
Identifiable intangible assets, useful life 10 years      
Useful life 41 months