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Subordinated Debentures - Schedule of Subordinated Debentures (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 23, 2007 | Jun. 15, 2005 | Sep. 20, 2004 | Mar. 26, 2003
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Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | $ 103,943 | $ 103,799 |  |  |  |
Subordinated Note [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | 73,594 | 73,450 |  |  |  |
First Citizens Statutory Trust II [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | 7,732 | 7,732 |  |  |  | $ 7,700
First Citizens Statutory Trust III [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | 12,887 | 12,887 |  |  | $ 12,900 |
First Citizens Statutory Trust IV [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | 5,155 | 5,155 | $ 5,200 |  |  |
Futura TPF Trust I [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | 2,578 | 2,578 |  | $ 2,600 |  |
Futura TPF Trust II [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | $ 1,997 | $ 1,997 |  | $ 2,100 |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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