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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 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 799,578 | $ 15,019
12 Months or Longer | 501 | 0
Total | 800,079 | 15,019
Gross Unrealized Losses |  |
Less than 12 Months | 16,153 | 349
12 Months or Longer | 8 | 0
Total | 16,161 | 349
State and municipal |  |
Fair Value |  |
Less than 12 Months | 273,742 | 5,368
12 Months or Longer | 501 | 0
Total | 274,243 | 5,368
Gross Unrealized Losses |  |
Less than 12 Months | 3,938 | 246
12 Months or Longer | 8 | 0
Total | 3,946 | 246
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | 525,836 | 9,651
12 Months or Longer | 0 | 0
Total | 525,836 | 9,651
Gross Unrealized Losses |  |
Less than 12 Months | 12,215 | 103
12 Months or Longer | 0 | 0
Total | $ 12,215 | $ 103

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