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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 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 523,718 | $ 15,019
12 Months or Longer | 0 | 0
Total | 523,718 | 15,019
Gross Unrealized Losses |  |
Less than 12 Months | 7,889 | 349
12 Months or Longer | 0 | 0
Total | 7,889 | 349
State and municipal |  |
Fair Value |  |
Less than 12 Months | 63,102 | 5,368
12 Months or Longer | 0 | 0
Total | 63,102 | 5,368
Gross Unrealized Losses |  |
Less than 12 Months | 518 | 246
12 Months or Longer | 0 | 0
Total | 518 | 246
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | 460,616 | 9,651
12 Months or Longer | 0 | 0
Total | 460,616 | 9,651
Gross Unrealized Losses |  |
Less than 12 Months | 7,371 | 103
12 Months or Longer | 0 | 0
Total | $ 7,371 | $ 103

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