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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 179,722 | $ 224,138
Fair value more than 12 months | 7,336 | 67,402
Total fair value | 187,058 | 291,540
Unrealized losses less than 12 months | (4,140) | (2,788)
Unrealized losses more than 12 months | (282) | (574)
Total unrealized losses | (4,422) | (3,362)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months |  | 1,413
Fair value more than 12 months |  | 0
Total fair value |  | 1,413
Unrealized losses less than 12 months |  | (2)
Unrealized losses more than 12 months |  | 0
Total unrealized losses |  | (2)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 152,037 | 129,942
Fair value more than 12 months | 7,336 | 6,279
Total fair value | 159,373 | 136,221
Unrealized losses less than 12 months | (3,956) | (2,374)
Unrealized losses more than 12 months | (282) | (131)
Total unrealized losses | (4,238) | (2,505)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 27,685 | 68,043
Fair value more than 12 months | 0 | 23,301
Total fair value | 27,685 | 91,344
Unrealized losses less than 12 months | (184) | (308)
Unrealized losses more than 12 months | 0 | (260)
Total unrealized losses | $ (184) | (568)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months |  | 24,740
Fair value more than 12 months |  | 37,822
Total fair value |  | 62,562
Unrealized losses less than 12 months |  | (104)
Unrealized losses more than 12 months |  | (183)
Total unrealized losses |  | (287)
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months |  | 0
Fair value more than 12 months |  | 0
Total fair value |  | 0
Unrealized losses less than 12 months |  | 0
Unrealized losses more than 12 months |  | 0
Total unrealized losses |  | $ 0

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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=118939692&loc=d3e27337-111563 + Details
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