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Impairment of Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2020
Impairment of Investment Securities Disclosure [Abstract] |
Schedule of Unrealized Losses and Estimated Fair Values | The following table presents the gross unrealized losses and estimated fair values at March 31, 2020 for both available for sale and held to maturity securities by investment category and time frame for which securities have been in a continuous unrealized loss position:
| Less Than 12 Months |  |  |  |  | 12 Months or More |  |  |  |  | Total |  |
| Estimated Fair Value |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  | Gross Unrealized Losses
| (dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Commercial | $ | 25,481 |  |  | $ | (215) |  |  |  | $ | — |  |  | $ | — |  |  |  | $ | 25,481 |  |  | $ | (215) |
Total Securities | $ | 25,481 |  |  | $ | (215) |  |  |  | $ | — |  |  | $ | — |  |  |  | $ | 25,481 |  |  | $ | (215) |
The following table presents the gross unrealized losses and estimated fair values at December 31, 2019 by investment category and time frame for which securities have been in a continuous unrealized loss position:
| Less Than 12 Months |  |  |  |  | 12 Months or More |  |  |  |  | Total |  |
| Estimated Fair Value |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  | Gross Unrealized Losses
| (dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. Government Agencies: |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities - Commercial | $ | 54,501 |  |  | $ | (201) |  |  |  | $ | 16,365 |  |  | $ | (149) |  |  |  | $ | 70,866 |  |  | $ | (350) |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 111,969 |  |  | (436) |  |  |  | 219,015 |  |  | (2,801) |  |  |  | 330,984 |  |  | (3,237) |
Total Securities | $ | 166,470 |  |  | $ | (637) |  |  |  | $ | 235,380 |  |  | $ | (2,950) |  |  |  | $ | 401,850 |  |  | $ | (3,587) |

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- Definition Impairment of Investment Securities Disclosure [Abstract] + 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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