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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 512,531 | $ 79,860
Unrealized losses less than 12 months | (10,172) | (294)
Fair value more than 12 months | 1,458 | 1,245
Unrealized losses more than 12 months | (107) | (29)
Total fair value | 513,989 | 81,105
Total unrealized losses | (10,279) | (323)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 37,697 | 17,215
Unrealized losses less than 12 months | (553) | (35)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 37,697 | 17,215
Total unrealized losses | (553) | (35)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 459,377 | 56,287
Unrealized losses less than 12 months | (9,485) | (242)
Fair value more than 12 months | 1,458 | 1,245
Unrealized losses more than 12 months | (107) | (29)
Total fair value | 460,835 | 57,532
Total unrealized losses | (9,592) | (271)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 2,380 | 6,358
Unrealized losses less than 12 months | (5) | (17)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 2,380 | 6,358
Total unrealized losses | (5) | (17)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 12,081 | 0
Unrealized losses less than 12 months | (125) | 0
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 12,081 | 0
Total unrealized losses | (125) | $ 0
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 996 |
Unrealized losses less than 12 months | (4) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 996 |
Total unrealized losses | $ (4) |

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