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2. Investment securities (Details 1) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value $ 10,857 $ 38,661
Less than 12 months, unrealized losses 39 387
12 months or more, fair value 4,454 12,502
12 months or more, unrealized losses 222 351
Total, fair value 15,311 51,163
Total, unrealized losses 261 738
Mortgage-Backed Securities    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value 10,857 28,395
Less than 12 months, unrealized losses 39 177
12 months or more, fair value 0 6,351
12 months or more, unrealized losses 0 50
Total, fair value 10,857 34,746
Total, unrealized losses 39 227
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 4,454 6,151
12 months or more, unrealized losses 222 301
Total, fair value 4,454 9,050
Total, unrealized losses $ 222 311
State and Political Subdivisions    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value   7,367
Less than 12 months, unrealized losses   200
12 months or more, fair value   0
12 months or more, unrealized losses   0
Total, fair value   7,367
Total, unrealized losses   $ 200