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2. Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Investment securities available for sale |
|  | March 31, 2021 |  |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
U.S Treasuries |  | $ | 7,960 |  |  |  | — |  |  |  | — |  |  |  | 7,960 |
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  |  | 12,939 |  |  |  | 282 |  |  |  | 202 |  |  |  | 13,019 |
Mortgage-backed securities |  |  | 184,445 |  |  |  | 2,225 |  |  |  | 967 |  |  |  | 185,703 |
State and political subdivisions |  |  | 117,186 |  |  |  | 3,070 |  |  |  | 1,421 |  |  |  | 118,835 |
Total |  | $ | 322,530 |  |  |  | 5,577 |  |  |  | 2,590 |  |  |  | 325,517 |
(Dollars in thousands)
|  | December 31, 2020
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  | $ | 7,384 |  |  |  | 331 |  |  |  | 208 |  |  |  | 7,507 |
Mortgage-backed securities |  |  | 143,095 |  |  |  | 2,812 |  |  |  | 593 |  |  |  | 145,314 |
State and political subdivisions |  |  | 87,757 |  |  |  | 4,758 |  |  |  | 87 |  |  |  | 92,428 |
Total |  | $ | 238,236 |  |  |  | 7,901 |  |  |  | 888 |  |  |  | 245,249 |
Current fair value and associated unrealized losses on investments in securities with unrealized losses |
|  | March 31, 2021
|  | Less than 12 Months |  | 12 Months or More |  | Total |  |
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  | $ | — |  |  |  | — |  |  |  | 4,098 |  |  |  | 202 |  |  |  | 4,098 |  |  |  | 202 |
Mortgage-backed securities |  |  | 82,322 |  |  |  | 947 |  |  |  | 1,979 |  |  |  | 20 |  |  |  | 84,301 |  |  |  | 967 |
State and political subdivisions |  |  | 38,420 |  |  |  | 1,421 |  |  |  | — |  |  |  | — |  |  |  | 38,420 |  |  |  | 1,421 |
Total |  | $ | 120,742 |  |  |  | 2,368 |  |  |  | 6,077 |  |  |  | 222 |  |  |  | 126,819 |  |  |  | 2,590 |
(Dollars in thousands)
|  | December 31, 2020
|  | Less than 12 Months |  | 12 Months or More |  | Total |  |
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  | $ | — |  |  |  | — |  |  |  | 4,193 |  |  |  | 208 |  |  |  | 4,193 |  |  |  | 208 |
Mortgage-backed securities |  |  | 80,827 |  |  |  | 565 |  |  |  | 4,762 |  |  |  | 28 |  |  |  | 85,589 |  |  |  | 593 |
State and political subdivisions |  |  | 7,126 |  |  |  | 87 |  |  |  | — |  |  |  | — |  |  |  | 7,126 |  |  |  | 87 |
Total |  | $ | 87,953 |  |  |  | 652 |  |  |  | 8,955 |  |  |  | 236 |  |  |  | 96,908 |  |  |  | 888 |
Amortized cost and estimated fair value of investment securities available for sale by contractual maturity |
|  | Amortized Cost |  | Estimated Fair Value
Due within one year |  | $ | 15,906 |  |  |  | 16,126 |
Due from one to five years |  |  | 10,216 |  |  |  | 10,785 |
Due from five to ten years |  |  | 87,596 |  |  |  | 89,027 |
Due after ten years |  |  | 24,367 |  |  |  | 23,876 |
Mortgage-backed securities |  |  | 184,445 |  |  |  | 185,703 |
Total |  | $ | 322,530 |  |  |  | 325,517 |

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