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Investment Securities - Allowance for credit losses on held to maturity debt securities by major security type (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Schedule of Held-to-Maturity Securities [Line Items]    
Beginning Balance $ 109,000  
Provision (Credit) (77,000) $ (82,000)
Ending Balance 32,000 32,000
Impact of adopting ASU 2016-13    
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  
Provision (Credit)   (1,000)
Ending Balance 2,000 2,000
Municipal | Impact of adopting ASU 2016-13    
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 107,000  
Provision (Credit) (77,000) (81,000)
Ending Balance $ 30,000 30,000
Corporate bonds and other securities | Impact of adopting ASU 2016-13    
Schedule of Held-to-Maturity Securities [Line Items]    
Beginning Balance   $ 111,000