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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2023
USD ($)
branchOffice
option
$ / shares
shares
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]            
Price per share, at acquisition date | $ / shares $ 42.84          
Goodwill   $ 478,750     $ 364,263 $ 364,263
Merger and acquisition expenses   12,182 $ 3,484      
Provision for credit losses   11,451 $ 3,500   12,600  
Unfunded Loan Commitment            
Business Acquisition [Line Items]            
Provision for credit losses   $ (870)   $ (1,500) (200)  
Core deposit intangibles            
Business Acquisition [Line Items]            
Useful life   10 years        
GrandSouth            
Business Acquisition [Line Items]            
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 | 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 consideration $ 229,489          
Number of locations | branchOffice 8          
Goodwill $ 114,487          
Fair value mark 29,500          
Allowance for loan losses 5,610          
Merger and acquisition expenses   $ 12,200        
Allowance for loan losses 300          
Allowance for credit loss, increase from acquisition, non-PCD 12,200          
GrandSouth | Unfunded Loan Commitment            
Business Acquisition [Line Items]            
Provision for credit losses $ 1,900 $ 1,921   $ 0 $ 0  
GrandSouth | Core deposit intangibles            
Business Acquisition [Line Items]            
Useful life 10 years          
Weighted average useful life 41 months