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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 | Mar. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 1,229,529 | $ 636,389
12 Months or Longer | 305,960 | 8,829
Total | 1,535,489 | 645,218
Gross Unrealized Losses |  |
Less than 12 Months | 82,916 | 13,239
12 Months or Longer | 36,622 | 401
Total | $ 119,538 | $ 13,640
Number of Securities | security | 721 | 161
U.S. Treasury |  |
Fair Value |  |
Less than 12 Months | $ 1,959 | $ 999
12 Months or Longer | 0 | 0
Total | 1,959 | 999
Gross Unrealized Losses |  |
Less than 12 Months | 5 | 1
12 Months or Longer | 0 | 0
Total | $ 5 | $ 1
Number of Securities | security | 2 | 1
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 54,473 | $ 68,524
12 Months or Longer | 23,869 | 0
Total | 78,342 | 68,524
Gross Unrealized Losses |  |
Less than 12 Months | 3,775 | 1,545
12 Months or Longer | 2,628 | 0
Total | $ 6,403 | $ 1,545
Number of Securities | security | 13 | 8
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 887,898 | $ 138,187
12 Months or Longer | 16,888 | 505
Total | 904,786 | 138,692
Gross Unrealized Losses |  |
Less than 12 Months | 62,732 | 894
12 Months or Longer | 2,594 | 4
Total | $ 65,326 | $ 898
Number of Securities | security | 585 | 103
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 284,223 | $ 427,687
12 Months or Longer | 265,203 | 8,324
Total | 549,426 | 436,011
Gross Unrealized Losses |  |
Less than 12 Months | 16,380 | 10,791
12 Months or Longer | 31,400 | 397
Total | $ 47,780 | $ 11,188
Number of Securities | security | 120 | 48
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 976 | $ 992
12 Months or Longer | 0 | 0
Total | 976 | 992
Gross Unrealized Losses |  |
Less than 12 Months | 24 | 8
12 Months or Longer | 0 | 0
Total | $ 24 | $ 8
Number of Securities | security | 1 | 1

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