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Investments in Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Collateralized Mortgage Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 10,279 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (831) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | $ 24,762
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (265)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 10,279 | 24,762
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (831) | (265)
Agency collateralized mortgage obligations |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 12,727 | 69,372
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (375) | (921)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 12,727 | 69,372
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (375) | (921)
States and political subdivisions securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,164 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,164 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (6) |
Unrealized Losses and Estimated Fair Value |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 24,170 | 91,430
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,212) | (995)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 24,762
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (265)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 24,170 | 116,192
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,212) | (1,260)
Small Business Administration securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 22,058
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (74)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 22,058
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (74)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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