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2. Investment securities (Details 1) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value $ 3,186 $ 13,531
Less than 12 months, unrealized losses 6 151
12 months or more, fair value 23,140 44,420
12 months or more, unrealized losses 571 1,243
Total, fair value 26,326 57,951
Total, unrealized losses 577 1,394
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 3,186 6,932
Less than 12 months, unrealized losses 6 56
12 months or more, fair value 13,994 17,670
12 months or more, unrealized losses 164 502
Total, fair value 17,180 24,602
Total, unrealized losses 170 558
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 0 1,784
Less than 12 months, unrealized losses 0 69
12 months or more, fair value 9,146 25,172
12 months or more, unrealized losses 407 724
Total, fair value 9,146 26,956
Total, unrealized losses $ 407 793
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value   4,815
Less than 12 months, unrealized losses   26
12 months or more, fair value   1,578
12 months or more, unrealized losses   17
Total, fair value   6,393
Total, unrealized losses   $ 43