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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 13,531 $ 22,160
Less than 12 Months, Unrealized Losses 151 175
12 Months or More, Fair Value 44,420 22,827
12 Months or More, Unrealized Losses 1,243 434
Total, Fair Value 57,951 44,987
Total, Unrealized Losses 1,394 609
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 6,932 8,701
Less than 12 Months, Unrealized Losses 56 75
12 Months or More, Fair Value 17,670 11,259
12 Months or More, Unrealized Losses 502 254
Total, Fair Value 24,602 19,960
Total, Unrealized Losses 558 329
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 1,784 12,661
Less than 12 Months, Unrealized Losses 69 98
12 Months or More, Fair Value 25,172 10,067
12 Months or More, Unrealized Losses 724 166
Total, Fair Value 26,956 22,728
Total, Unrealized Losses 793 264
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 4,815 798
Less than 12 Months, Unrealized Losses 26 2
12 Months or More, Fair Value 1,578 1,501
12 Months or More, Unrealized Losses 17 14
Total, Fair Value 6,393 2,299
Total, Unrealized Losses $ 43 $ 16