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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) $ in Thousands | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 1,734,298 | $ 636,389
12 Months or Longer | 288,367 | 8,829
Total | 2,022,665 | 645,218
Gross Unrealized Losses |  |
Less than 12 Months | 192,376 | 13,239
12 Months or Longer | 56,769 | 401
Total | $ 249,145 | $ 13,640
Number of Securities | security | 1,126 | 161
U.S. Treasury |  |
Fair Value |  |
Less than 12 Months | $ 16,189 | $ 999
12 Months or Longer | 0 | 0
Total | 16,189 | 999
Gross Unrealized Losses |  |
Less than 12 Months | 111 | 1
12 Months or Longer | 0 | 0
Total | $ 111 | $ 1
Number of Securities | security | 3 | 1
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 77,942 | $ 68,524
12 Months or Longer | 22,208 | 0
Total | 100,150 | 68,524
Gross Unrealized Losses |  |
Less than 12 Months | 6,480 | 1,545
12 Months or Longer | 3,706 | 0
Total | $ 10,186 | $ 1,545
Number of Securities | security | 14 | 8
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 1,285,071 | $ 138,187
12 Months or Longer | 15,481 | 505
Total | 1,300,552 | 138,692
Gross Unrealized Losses |  |
Less than 12 Months | 158,718 | 894
12 Months or Longer | 3,972 | 4
Total | $ 162,690 | $ 898
Number of Securities | security | 936 | 103
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 343,302 | $ 427,687
12 Months or Longer | 250,678 | 8,324
Total | 593,980 | 436,011
Gross Unrealized Losses |  |
Less than 12 Months | 26,834 | 10,791
12 Months or Longer | 49,091 | 397
Total | $ 75,925 | $ 11,188
Number of Securities | security | 164 | 48
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 11,794 | $ 992
12 Months or Longer | 0 | 0
Total | 11,794 | 992
Gross Unrealized Losses |  |
Less than 12 Months | 233 | 8
12 Months or Longer | 0 | 0
Total | $ 233 | $ 8
Number of Securities | security | 9 | 1

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