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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jan. 01, 2023
USD ($)
option
branchOffice
$ / shares
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]            
Price per share, at acquisition date | $ / shares $ 42.84          
Goodwill   $ 478,750   $ 478,750   $ 478,750
Financing receivable, excluding accrued interest, credit loss expense (reversal)   $ 1,450 $ 3,700 3,250 $ 15,151  
Unfunded Loan Commitment            
Business Acquisition [Line Items]            
Financing receivable, excluding accrued interest, credit loss expense (reversal)       $ (1,509) (2,209)  
Core deposit intangibles            
Business Acquisition [Line Items]            
Useful life   10 years   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          
Less: Total consideration $ 229,489          
Number of locations | branchOffice 8          
Goodwill $ 114,487          
Fair value mark 29,500          
Initial allowance recorded for PCD loans $ 5,610          
GrandSouth | Unfunded Loan Commitment            
Business Acquisition [Line Items]            
Financing receivable, excluding accrued interest, credit loss expense (reversal)       $ 0 $ 1,921  
GrandSouth | Core deposit intangibles            
Business Acquisition [Line Items]            
Useful life 10 years          
Weighted average useful life 41 months