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2. Investment securities (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value $ 20,841 $ 38,661
Less than 12 months, unrealized losses 267 387
12 months or more, fair value 5,536 12,502
12 months or more, unrealized losses 272 351
Total, fair value 26,377 51,163
Total, unrealized losses 539 738
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 12,376 28,395
Less than 12 months, unrealized losses 130 177
12 months or more, fair value 0 6,351
12 months or more, unrealized losses 0 50
Total, fair value 12,376 34,746
Total, unrealized losses 130 227
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 5,536 6,151
12 months or more, unrealized losses 272 301
Total, fair value 5,536 9,050
Total, unrealized losses 272 311
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 8,465 7,367
Less than 12 months, unrealized losses 137 200
12 months or more, fair value 0 0
12 months or more, unrealized losses 0 0
Total, fair value 8,465 7,367
Total, unrealized losses $ 137 $ 200