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Investment Securities - Allowance for credit losses of held to maturity securities by major security type (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance $ 100,000 $ 109,000 $ 37,000  
Provision (Recovery) (12,000) (77,000) 51,000 $ (82,000)
Ending Balance 88,000 32,000 88,000 32,000
Cumulative Effect, Period of Adoption, Adjustment        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance       114,000
U.S. Agency        
Schedule of Held-to-Maturity Securities [Line Items]        
Ending Balance 0   0  
U.S. Agency mortgage-backed securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Ending Balance 0   0  
Municipal        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance 2,000 2,000 2,000  
Provision (Recovery)       (1,000)
Ending Balance 2,000 2,000 2,000 2,000
Municipal | Cumulative Effect, Period of Adoption, Adjustment        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance       3,000
Corporate bonds and other securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance 98,000 107,000 35,000  
Provision (Recovery) (12,000) (77,000) 51,000 (81,000)
Ending Balance $ 86,000 $ 30,000 $ 86,000 30,000
Corporate bonds and other securities | Cumulative Effect, Period of Adoption, Adjustment        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance       $ 111,000