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2. Investment securities (Details 1) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value $ 28,075 $ 38,661
Less than 12 months, unrealized losses 553 387
12 months or more, fair value 7,297 12,502
12 months or more, unrealized losses 214 351
Total, fair value 35,372 51,163
Total, unrealized losses 767 738
Mortgage-Backed Securities    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value 24,665 28,395
Less than 12 months, unrealized losses 532 177
12 months or more, fair value 3,013 6,351
12 months or more, unrealized losses 1 50
Total, fair value 27,678 34,746
Total, unrealized losses 533 227
U.S. Government Sponsored Enterprises    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value 0 2,899
Less than 12 months, unrealized losses 0 10
12 months or more, fair value 4,284 6,151
12 months or more, unrealized losses 213 301
Total, fair value 4,284 9,050
Total, unrealized losses 213 311
State and Political Subdivisions    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value 3,410 7,367
Less than 12 months, unrealized losses 21 200
12 months or more, fair value 0 0
12 months or more, unrealized losses 0 0
Total, fair value 3,410 7,367
Total, unrealized losses $ 21 $ 200