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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 16,509 $ 36,155
Less than 12 Months, Unrealized Losses 144 507
12 Months or More, Fair Value 16,540 10,123
12 Months or More, Unrealized Losses 223 209
Total, Fair Value 33,049 46,278
Total, Unrealized Losses 367 716
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 10,540 15,594
Less than 12 Months, Unrealized Losses 95 290
12 Months or More, Fair Value 4,792 0
12 Months or More, Unrealized Losses 101 0
Total, Fair Value 15,332 15,594
Total, Unrealized Losses 196 290
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 5,424 10,120
Less than 12 Months, Unrealized Losses 47 94
12 Months or More, Fair Value 10,762 9,562
12 Months or More, Unrealized Losses 104 180
Total, Fair Value 16,186 19,682
Total, Unrealized Losses 151 274
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 545 10,441
Less than 12 Months, Unrealized Losses 2 123
12 Months or More, Fair Value 986 561
12 Months or More, Unrealized Losses 18 29
Total, Fair Value 1,531 11,002
Total, Unrealized Losses $ 20 $ 152