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Securities, Securities with Unrealized Losses, Securities Pledged as Collateral and Holdings of Securities by One Issuer in Amount Greater Than 10% of Stockholders' Equity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Securities Available-for-Sale [Abstract] |  |
Securities of any one issuer, other than U.S. Government, exceeding 10% of stockholders' equity | $ 0.0 | $ 0.0
Accrued interest receivable on securities | $ 1.2 | $ 1.2
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest receivable | Accrued interest receivable
Securities in nonaccrual status | $ 0.0 | $ 0.0
Securities purchased with deterioration in credit quality | 0.0 | 0.0
Collateral dependent securities | 0.0 | 0.0
Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 89.0 | 64.4
Federal Reserve for Borrowings under Bank Term Funding Program [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral, at book value | 107.3 |
Securities pledged as collateral | 98.3 |
Asset Pledged as Collateral [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 89.0 | 64.4
Asset Pledged as Collateral [Member] | Public Deposits [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 0.0 | 0.0
U.S. Treasuries [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 47.8 | 19.2
U.S. Treasuries [Member] | Asset Pledged as Collateral [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 47.8 | 19.2
Federal Agency Debt [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 30.2 | 33.3
Federal Agency Debt [Member] | Asset Pledged as Collateral [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 30.2 | 33.3
Federal Agency Mortgage-backed Securities [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | 11.0 | 11.9
Federal Agency Mortgage-backed Securities [Member] | Asset Pledged as Collateral [Member] | Securities Sold under Agreements to Repurchase [Member] |  |
Debt Securities Available-for-Sale [Abstract] |  |
Securities pledged as collateral | $ 11.0 | $ 11.9

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- Definition Represents risk arising from securities held by individual issuers in an amount exceeding 10% of stockholders' equity. Excludes U.S. Government and its agencies. + References No definition available. + Details
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- Definition The amortized cost as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References No definition available. + Details
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- Definition Amount of securities whose repayment is expected to be provided substantially through the operation or sale of the collateral. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-3A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-3B + Details
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- Definition Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-3A + Details
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- Definition Amount at purchase price of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-10 + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity) on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481961/940-320-45-2 + Details
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