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Investment Securities - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 789,968 | $ 15,019
12 Months or Longer | 0 | 0
Total | 789,968 | 15,019
Gross Unrealized Losses |  |
Less than 12 Months | 19,186 | 349
12 Months or Longer | 0 | 0
Total | 19,186 | 349
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | 9,837 |
12 Months or Longer | 0 |
Total | 9,837 |
Gross Unrealized Losses |  |
Less than 12 Months | 163 |
12 Months or Longer | 0 |
Total | 163 |
State and municipal |  |
Fair Value |  |
Less than 12 Months | 172,655 | 5,368
12 Months or Longer | 0 | 0
Total | 172,655 | 5,368
Gross Unrealized Losses |  |
Less than 12 Months | 2,654 | 246
12 Months or Longer | 0 | 0
Total | 2,654 | 246
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | 606,498 | 9,651
12 Months or Longer | 0 | 0
Total | 606,498 | 9,651
Gross Unrealized Losses |  |
Less than 12 Months | 16,347 | 103
12 Months or Longer | 0 | 0
Total | 16,347 | $ 103
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | 978 |
12 Months or Longer | 0 |
Total | 978 |
Gross Unrealized Losses |  |
Less than 12 Months | 22 |
12 Months or Longer | 0 |
Total | $ 22 |

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