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Qualified affordable housing project investments (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Investment Program, Proportional Amortization Method, Elected [Line Items]          
Qualified affordable housing projects $ 22,600,000   $ 22,600,000   $ 17,900,000
Total unfunded commitments 15,100,000   15,100,000   $ 12,300,000
Amortization expense 513,000 $ 426,000 1,300,000 $ 1,300,000  
Tax credits and other benefits $ 602,000 $ 558,000 1,600,000 1,600,000  
Impairment losses     $ 0 $ 0