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Investment Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Investment Securities Available for Sale |  |
Amortized cost | $ 398,606 |
Estimated fair value | 402,905 | $ 245,249
Total [Member] |  |
Investment Securities Available for Sale |  |
Amortized cost | 398,606 | 238,236
Gross unrealized gains | 7,082 | 7,901
Gross unrealized losses | 2,783 | 888
Estimated fair value | 402,905 | 245,249
U.S. Government Sponsored Enterprises [Member] |  |
Investment Securities Available for Sale |  |
Amortized cost | 14,566 | 7,384
Gross unrealized gains | 289 | 331
Gross unrealized losses | 178 | 208
Estimated fair value | 14,677 | 7,507
Mortgage-Backed Securities [Member] |  |
Investment Securities Available for Sale |  |
Amortized cost | 222,526 | 143,095
Gross unrealized gains | 2,427 | 2,812
Gross unrealized losses | 1,648 | 593
Estimated fair value | 223,305 | 145,314
State and Political Subdivisions [Member] |  |
Investment Securities Available for Sale |  |
Amortized cost | 153,551 | 87,757
Gross unrealized gains | 4,327 | 4,758
Gross unrealized losses | 945 | 87
Estimated fair value | 156,933 | $ 92,428
U S Treasuries [Member] |  |
Investment Securities Available for Sale |  |
Amortized cost | 7,963 |
Gross unrealized gains | 39 |
Gross unrealized losses | 12 |
Estimated fair value | $ 7,990 |

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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