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Borrowings and Borrowings Availability - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Short-term borrowings | $ 220,000,000.0 | $ 0
Borrowings | 290,918,000 | 71,050,000
Trust Preferred Securities due January 2034 |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 20,600,000 |
Trust Preferred Securities due January 2034 | Three-month LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.70% |
First Bancorp Capital Trust III |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 10,300,000 |
Trust Preferred Securities due June 2036 |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 25,800,000 |
Trust Preferred Securities due June 2036 | Three-month LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 1.39% |
Trust Preferred Securities due January 2035 |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 10,300,000 |
Trust Preferred Securities due January 2035 | Three-month LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.00% |
Trust Preferred Securities Due September 20, 2034 |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 12,372,000 | $ 12,372,000
Trust Preferred Securities Due September 20, 2034 | Three-month LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.15% | 2.15%
FHLB Line of Credit |  |
Debt Instrument [Line Items] |  |
Line of credit, borrowing capacity | $ 847,100,000 |
Line of credit, outstanding | 221,800,000 | $ 2,000,000
Federal Funds Line of Credit |  |
Debt Instrument [Line Items] |  |
Line of credit, borrowing capacity | 265,000,000 |
Line of credit, outstanding | 0 | 0
FRB Line of Credit |  |
Debt Instrument [Line Items] |  |
Line of credit, outstanding | 0 | $ 0
Unused portion | $ 165,400,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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