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2. Investment securities (Details 1) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value $ 12,273 $ 13,531
Less than 12 months, unrealized losses 77 151
12 months or more, fair value 14,171 44,420
12 months or more, unrealized losses 389 1,243
Total, fair value 26,444 57,951
Total, unrealized losses 466 1,394
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 12,273 6,932
Less than 12 months, unrealized losses 77 56
12 months or more, fair value 7,689 17,670
12 months or more, unrealized losses 87 502
Total, fair value 19,962 24,602
Total, unrealized losses 164 558
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 6,482 25,172
12 months or more, unrealized losses 302 724
Total, fair value 6,482 26,956
Total, unrealized losses $ 302 793
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