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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 |  |  |  |  |

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