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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 111,815 | $ 224,138
Unrealized losses less than 12 months | (745) | (2,788)
Fair value more than 12 months | 1,307 | 67,402
Unrealized losses more than 12 months | (42) | (574)
Total fair value | 113,122 | 291,540
Total unrealized losses | (787) | (3,362)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 5,239 | 1,413
Unrealized losses less than 12 months | (11) | (2)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 5,239 | 1,413
Total unrealized losses | (11) | (2)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 105,976 | 129,942
Unrealized losses less than 12 months | (733) | (2,374)
Fair value more than 12 months | 1,307 | 6,279
Unrealized losses more than 12 months | (42) | (131)
Total fair value | 107,283 | 136,221
Total unrealized losses | (775) | (2,505)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 600 | 68,043
Unrealized losses less than 12 months | (1) | (308)
Fair value more than 12 months | 0 | 23,301
Unrealized losses more than 12 months | 0 | (260)
Total fair value | 600 | 91,344
Total unrealized losses | $ (1) | (568)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months |  | 24,740
Unrealized losses less than 12 months |  | (104)
Fair value more than 12 months |  | 37,822
Unrealized losses more than 12 months |  | (183)
Total fair value |  | 62,562
Total unrealized losses |  | $ (287)

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