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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | $ 552,104 | $ 79,860
Unrealized losses less than 12 months | (5,946) | (294)
Fair value more than 12 months | 1,435 | 1,245
Unrealized losses more than 12 months | (90) | (29)
Total fair value | 553,539 | 81,105
Total unrealized losses | (6,036) | (323)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 96,033 | 17,215
Unrealized losses less than 12 months | (617) | (35)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 96,033 | 17,215
Total unrealized losses | (617) | (35)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 346,889 | 56,287
Unrealized losses less than 12 months | (5,103) | (242)
Fair value more than 12 months | 1,435 | 1,245
Unrealized losses more than 12 months | (90) | (29)
Total fair value | 348,324 | 57,532
Total unrealized losses | (5,193) | (271)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 412 | 6,358
Unrealized losses less than 12 months | (2) | (17)
Fair value more than 12 months | 0 | 0
Unrealized losses more than 12 months | 0 | 0
Total fair value | 412 | 6,358
Total unrealized losses | (2) | $ (17)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 77,091 |
Unrealized losses less than 12 months | (147) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 77,091 |
Total unrealized losses | (147) |
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 9,510 |
Unrealized losses less than 12 months | (14) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 9,510 |
Total unrealized losses | (14) |
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value less than 12 months | 22,169 |
Unrealized losses less than 12 months | (63) |
Fair value more than 12 months | 0 |
Unrealized losses more than 12 months | 0 |
Total fair value | 22,169 |
Total unrealized losses | $ (63) |

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