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Investment securities (Details 1) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Less than 12 months, fair value $ 162,998,000 $ 87,953,000
Less than 12 months, unrealized losses 2,322,000 652,000
12 months or more, fair value 13,096,000 8,955,000
12 months or more, unrealized losses 461,000 236,000
Total, fair value 176,094,000 96,908,000
Total, unrealized losses 2,783,000 888,000
U.S. Government Sponsored Enterprises [Member]    
Less than 12 months, fair value 5,386,000 0
Less than 12 months, unrealized losses 5,000 0
12 months or more, fair value 3,442,000 4,193,000
12 months or more, unrealized losses 173,000 208,000
Total, fair value 8,828,000 4,193,000
Total, unrealized losses 178,000 208,000
Mortgage-Backed Securities [Member]    
Less than 12 months, fair value 114,889,000 80,827,000
Less than 12 months, unrealized losses 1,505,000 565,000
12 months or more, fair value 5,897,000 4,762,000
12 months or more, unrealized losses 143,000 28,000
Total, fair value 120,786,000 85,589,000
Total, unrealized losses 1,648,000 593,000
State and Political Subdivisions [Member]    
Less than 12 months, fair value 37,729,000 7,126,000
Less than 12 months, unrealized losses 800,000 87,000
12 months or more, fair value 3,757,000 0
12 months or more, unrealized losses 145,000 0
Total, fair value 41,486,000 7,126,000
Total, unrealized losses 945,000 $ 87,000
U.S. Treasuries [Member]    
Less than 12 months, fair value 4,994,000  
Less than 12 months, unrealized losses 12,000  
12 months or more, fair value 0  
12 months or more, unrealized losses 0  
Total, fair value 4,994,000  
Total, unrealized losses $ 12,000