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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance $ 85,000 $ 100,000 $ 89,000 $ 37,000
Provision (Recovery) 9,000 (12,000) 5,000 51,000
Ending Balance 94,000 88,000 94,000 88,000
Municipal        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance 2,000 2,000 2,000 2,000
Provision (Recovery) (1,000)   (1,000)  
Ending Balance 1,000 2,000 1,000 2,000
Corporate bonds and other securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance 83,000 98,000 87,000 35,000
Provision (Recovery) 10,000 (12,000) 6,000 51,000
Ending Balance $ 93,000 $ 86,000 $ 93,000 $ 86,000