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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 55,034 $ 22,160
Less than 12 Months, Unrealized Losses 1,074 175
12 Months or More, Fair Value 30,995 22,827
12 Months or More, Unrealized Losses 1,433 434
Total, Fair Value 86,029 44,987
Total, Unrealized Losses 2,507 609
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 20,557 8,701
Less than 12 Months, Unrealized Losses 276 75
12 Months or More, Fair Value 14,698 11,259
12 Months or More, Unrealized Losses 701 254
Total, Fair Value 35,255 19,960
Total, Unrealized Losses 977 329
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 19,435 12,661
Less than 12 Months, Unrealized Losses 586 98
12 Months or More, Fair Value 14,564 10,067
12 Months or More, Unrealized Losses 692 166
Total, Fair Value 33,999 22,728
Total, Unrealized Losses 1,278 264
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 15,042 798
Less than 12 Months, Unrealized Losses 212 2
12 Months or More, Fair Value 1,733 1,501
12 Months or More, Unrealized Losses 40 14
Total, Fair Value 16,775 2,299
Total, Unrealized Losses $ 252 $ 16