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Acquisitions and Dispositions - Acquisitions, Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 15, 2021 USD ($) location $ / shares shares | Sep. 01, 2020 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 364,263 | $ 239,272 | $ 234,368
Loans |  |  | 6,081,715 | 4,731,315 | 4,453,466
Merger and acquisition expenses |  |  | 16,845 | 0 | 192
Provision for loan losses |  |  | 9,611 | 35,039 | 2,263
Provision for unfunded commitments |  |  | $ 5,420 | 0 | $ 0
Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets, useful life |  |  | 5 years |  |
Core Deposits | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets, useful life |  |  | 10 years |  |
Core Deposits | Weighted Average |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets, useful life |  |  | 41 months |  |
Select |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Option price, cash out value (in usd per share) | $ / shares | $ 18.00 |  |  |  |
Number banking locations | location | 22 |  |  |  |
Merger and acquisition expenses |  |  | $ 800 |  |
Provision for loan losses |  |  | (1,300) | $ 6,200 |
Select |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common Stock Portion, number of First Bancorp's stock for each share of Select common stock converted (in shares) | shares | 0.408 |  |  |  |
Number of shares issued | shares | 7,070,371 |  |  |  |
Fair value of shares issued | $ 324,400 |  |  |  |
Payments for acquisition | 1,400 |  |  |  |
Total purchase price | $ 325,819 |  |  |  |
Percentage of voting interest acquired | 100.00% |  |  |  |
Goodwill | $ 132,356 |  |  |  |
Loans | 19,300 |  |  |  |
Loans reclassified from fair value mark to ACL resulting from PCD loans | 4,895 |  |  |  |
Merger and acquisition expenses |  |  | 16,800 |  |
Other assets acquired | 61,020 |  |  |  |
Liabilities assumed | $ 1,621,421 |  |  |  |
Select | Adjustment for Non-PCD Provision |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Provision for loan losses |  |  | 14,100 |  |
Select | Adjustment on Initial Recording of Provision |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Provision for unfunded commitments |  |  | $ 3,900 |  |
Magnolia Financial, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares issued | shares |  | 24,096 |  |  |
Fair value of shares issued |  | $ 500 |  |  |
Payments for acquisition |  | 9,500 |  |  |
Total purchase price |  | 10,000 |  |  |
Loans acquired |  | 14,600 |  |  |
Other assets acquired |  | 500 |  |  |
Liabilities assumed |  | 11,700 |  |  |
Goodwill deductible for tax purposes |  | 4,900 |  |  |
Intangible assets deductible for tax purposes |  | $ 1,600 |  |  |
Intangible assets and goodwill, deductible for tax purposes, period |  | 15 years |  |  |

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