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Investment Securities - Amortized Costs, Gains and Losses, Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | $ 193,785 | $ 175,123
Gross Unrealized Gains | 4,570 | 768
Gross Unrealized Losses | (325) | (798)
Fair value | 198,030 | 175,093
U.S. Treasury |  |
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | 2,772 | 987
Gross Unrealized Gains | 26 | 8
Fair value | 2,798 | 995
U.S government agency obligations |  |
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | 11,732 | 8,124
Gross Unrealized Gains | 197 |
Gross Unrealized Losses |  | (77)
Fair value | 11,929 | 8,047
U.S. government-sponsored enterprises |  |
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | 22,495 | 22,300
Gross Unrealized Gains | 379 | 41
Gross Unrealized Losses |  | (58)
Fair value | 22,874 | 22,283
Obligations of states and political subdivisions |  |
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | 56,943 | 33,704
Gross Unrealized Gains | 1,801 | 144
Gross Unrealized Losses |  | (59)
Fair value | 58,744 | 33,789
Mortgage-backed securities |  |
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | 88,357 | 105,522
Gross Unrealized Gains | 1,809 | 522
Gross Unrealized Losses | (54) | (428)
Fair value | 90,112 | 105,616
Other debt securities |  |
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | 10,000 | 3,000
Gross Unrealized Gains | 358 | 53
Gross Unrealized Losses | (14) |
Fair value | 10,344 | 3,053
Bank issued trust preferred securities |  |
Amortized cost, gross urealized gains and losses, and fair value of debt securities classified as available-for-sale |  |
Total Amortized Cost | 1,486 | 1,486
Gross Unrealized Losses | (257) | (176)
Fair value | $ 1,229 | $ 1,310

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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