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Subordinated Debentures - Schedule of Subordinated Debentures (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 23, 2007 | Jun. 15, 2005 | Sep. 20, 2004 | Mar. 26, 2003
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Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | $ 103,799 | $ 103,735 |  |  |  |
Subordinated Note [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Total subordinated debentures | 73,450 | 73,386 |  |  |  |
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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -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(a)(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: 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 + Details
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