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Investment Securities - Allowance for credit losses of held to maturity securities by major security type (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance $ 96,000 $ 90,000 $ 89,000 $ 37,000
Provision (Recovery) (11,000) 10,000 (4,000) 63,000
Ending Balance 85,000 100,000 85,000 100,000
Municipal        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance 1,000 2,000 2,000 2,000
Provision (Recovery) 1,000      
Ending Balance 2,000 2,000 2,000 2,000
Corporate bonds and other securities        
Schedule of Held-to-Maturity Securities [Line Items]        
Beginning Balance 95,000 88,000 87,000 35,000
Provision (Recovery) (12,000) 10,000 (4,000) 63,000
Ending Balance $ 83,000 $ 98,000 $ 83,000 $ 98,000