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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Investment securities with continuous unrealized loss position |  |
Less than 12 Months, Fair Value | $ 1,794 | $ 13,531
Less than 12 Months, Unrealized Losses | 6 | 151
12 Months or More, Fair Value | 46,060 | 44,420
12 Months or More, Unrealized Losses | 969 | 1,243
Total, Fair Value | 47,854 | 57,951
Total, Unrealized Losses | 975 | 1,394
Mortgage-backed securities |  |
Investment securities with continuous unrealized loss position |  |
Less than 12 Months, Fair Value | 1,520 | 6,932
Less than 12 Months, Unrealized Losses | 5 | 56
12 Months or More, Fair Value | 17,948 | 17,670
12 Months or More, Unrealized Losses | 389 | 502
Total, Fair Value | 19,468 | 24,602
Total, Unrealized Losses | 394 | 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 | 26,240 | 25,172
12 Months or More, Unrealized Losses | 569 | 724
Total, Fair Value | 26,240 | 26,956
Total, Unrealized Losses | 569 | 793
State and political subdivisions |  |
Investment securities with continuous unrealized loss position |  |
Less than 12 Months, Fair Value | 274 | 4,815
Less than 12 Months, Unrealized Losses | 1 | 26
12 Months or More, Fair Value | 1,872 | 1,578
12 Months or More, Unrealized Losses | 11 | 17
Total, Fair Value | 2,146 | 6,393
Total, Unrealized Losses | $ 12 | $ 43

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