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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | The amortized cost and estimated fair value of securities available for sale along with gross unrealized gains and losses are summarized as follows:
(dollars in thousands) |  |  |  |  |  |  |
September 30, 2020 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Available for Sale: |  |  |  |  |  |  |
U.S. treasury securities | $ | 245 |  |  | $ | — |  |  | $ | — |  |  | $ | 245 |
State, county & municipal securities | 38,494 |  |  | 571 |  |  | (159) |  |  | 38,906 |
Corporate debt securities | 3,750 |  |  | 3 |  |  | — |  |  | 3,753 |
Mortgage-backed securities | 312,764 |  |  | 8,418 |  |  | (485) |  |  | 320,697 |
| $ | 355,253 |  |  | $ | 8,992 |  |  | $ | (644) |  |  | $ | 363,601 |
December 31, 2019 |  |  |  |  |  |  |
Securities Available for Sale: |  |  |  |  |  |  |
State, county & municipal securities | $ | 5,133 |  |  | $ | 36 |  |  | $ | (54) |  |  | $ | 5,115 |
Corporate debt securities | 2,811 |  |  | 11 |  |  | (16) |  |  | 2,806 |
Mortgage-backed securities | 338,930 |  |  | 2,669 |  |  | (2,188) |  |  | 339,411 |
| $ | 346,874 |  |  | $ | 2,716 |  |  | $ | (2,258) |  |  | $ | 347,332 |
Investments Classified by Contractual Maturity Date | This is often the case with mortgage-backed securities, which are disclosed separately in the table below.
| Securities Available for Sale
(dollars in thousands) | Amortized Cost |  | Fair Value
Due in one year or less | $ | 892 |  |  | $ | 895 |
Due after one year through five years | 3,939 |  |  | 3,989 |
Due after five years through ten years | 7,336 |  |  | 7,505 |
Due after ten years | 30,322 |  |  | 30,515 |
| $ | 42,489 |  |  | $ | 42,904 |
Mortgage-backed securities | 312,764 |  |  | 320,697 |
| $ | 355,253 |  |  | $ | 363,601 |
Schedule of Unrealized Loss on Investments | Information pertaining to securities with gross unrealized losses at September 30, 2020 and December 31, 2019 aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows:
| Less Than 12 Months |  | 12 Months or Greater |  | Total
(dollars in thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
September 30, 2020 |  |  |  |  |  |  |  |  |  |  |
State, county & municipal securities | $ | 14,173 |  |  | $ | (159) |  |  | $ | — |  |  | $ | — |  |  | $ | 14,173 |  |  | $ | (159) |
Mortgage-backed securities | 36,344 |  |  | (177) |  |  | 4,185 |  |  | (308) |  |  | 40,529 |  |  | (485) |
| $ | 50,517 |  |  | $ | (336) |  |  | $ | 4,185 |  |  | $ | (308) |  |  | $ | 54,702 |  |  | $ | (644) |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
State, county & municipal securities | $ | 3,257 |  |  | $ | (54) |  |  | $ | — |  |  | $ | — |  |  | $ | 3,257 |  |  | $ | (54) |
Corporate debt securities | — |  |  | — |  |  | 784 |  |  | (16) |  |  | 784 |  |  | (16) |
Mortgage-backed securities | 60,860 |  |  | (277) |  |  | 119,110 |  |  | (1,911) |  |  | 179,970 |  |  | (2,188) |
| $ | 64,117 |  |  | $ | (331) |  |  | $ | 119,894 |  |  | $ | (1,927) |  |  | $ | 184,011 |  |  | $ | (2,258) |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
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