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Income Taxes - Narrative (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Operating Loss Carryforwards [Line Items]    
Deferred tax assets (liabilities) related to net unrealized holdings losses/(gains) in the available-for-sale securities portfolio $ 33,900,000 $ 32,700,000
Deferred tax assets related to employee benefit plans 5,600,000 8,400,000
Valuation allowance 0 $ 0
NEW YORK    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards 8,500,000  
New York City    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards $ 344,000