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Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Operating Loss Carryforwards [Line Items]
Deferred tax assets (liabilities) related to net unrealized holdings losses/(gains) in the available-for-sale securities portfolio	$ 32,700,000	$ 58,600,000
Deferred tax assets related to employee benefit plans	8,400,000	9,800,000
Valuation allowance	0	$ 0
NEW YORK
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	8,600,000
New York City
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 400,000

X

- Definition

The value of employee benefit plans excluded from the deferred tax asset calculation as of the balance sheet date.

+ References

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- Definition

The value of net unrealized holding gains in available for sale securities excluded from deferred tax liabilities calculation as of the balance sheet date.

+ References

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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