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Investment securities (Details 1) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Less than 12 months, fair value | $ 162,998,000 | $ 87,953,000
Less than 12 months, unrealized losses | 2,322,000 | 652,000
12 months or more, fair value | 13,096,000 | 8,955,000
12 months or more, unrealized losses | 461,000 | 236,000
Total, fair value | 176,094,000 | 96,908,000
Total, unrealized losses | 2,783,000 | 888,000
U.S. Government Sponsored Enterprises [Member] |  |
Less than 12 months, fair value | 5,386,000 | 0
Less than 12 months, unrealized losses | 5,000 | 0
12 months or more, fair value | 3,442,000 | 4,193,000
12 months or more, unrealized losses | 173,000 | 208,000
Total, fair value | 8,828,000 | 4,193,000
Total, unrealized losses | 178,000 | 208,000
Mortgage-Backed Securities [Member] |  |
Less than 12 months, fair value | 114,889,000 | 80,827,000
Less than 12 months, unrealized losses | 1,505,000 | 565,000
12 months or more, fair value | 5,897,000 | 4,762,000
12 months or more, unrealized losses | 143,000 | 28,000
Total, fair value | 120,786,000 | 85,589,000
Total, unrealized losses | 1,648,000 | 593,000
State and Political Subdivisions [Member] |  |
Less than 12 months, fair value | 37,729,000 | 7,126,000
Less than 12 months, unrealized losses | 800,000 | 87,000
12 months or more, fair value | 3,757,000 | 0
12 months or more, unrealized losses | 145,000 | 0
Total, fair value | 41,486,000 | 7,126,000
Total, unrealized losses | 945,000 | $ 87,000
U.S. Treasuries [Member] |  |
Less than 12 months, fair value | 4,994,000 |
Less than 12 months, unrealized losses | 12,000 |
12 months or more, fair value | 0 |
12 months or more, unrealized losses | 0 |
Total, fair value | 4,994,000 |
Total, unrealized losses | $ 12,000 |

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