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Investment Securities - Allowance for credit losses of held to maturity securities by major security type (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Held-to-Maturity Securities [Line Items]    
Beginning Balance $ 89,000 $ 37,000
Provision (Recovery) 7,000 53,000
Ending Balance 96,000 90,000
Municipal    
Schedule of Held-to-Maturity Securities [Line Items]    
Beginning Balance 2,000 2,000
Provision (Recovery) (1,000)  
Ending Balance 1,000 2,000
Corporate bonds and other securities    
Schedule of Held-to-Maturity Securities [Line Items]    
Beginning Balance 87,000 35,000
Provision (Recovery) 8,000 53,000
Ending Balance $ 95,000 $ 88,000