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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 | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 99,430 | $ 1,423,379
12 Months or Longer | 1,400,671 | 487,129
Total | 1,500,101 | 1,910,508
Gross Unrealized Losses |  |
Less than 12 Months | 10,826 | 172,828
12 Months or Longer | 371,972 | 124,297
Total | $ 382,798 | $ 297,125
Number of Securities | security | 936 | 1,154
U.S. Treasury |  |
Fair Value |  |
Less than 12 Months | $ 397 | $ 2,459
12 Months or Longer | 1,316 | 0
Total | 1,713 | 2,459
Gross Unrealized Losses |  |
Less than 12 Months | 1 | 42
12 Months or Longer | 23 | 0
Total | $ 24 | $ 42
Number of Securities | security | 3 | 5
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 796 | $ 48,940
12 Months or Longer | 92,789 | 53,022
Total | 93,585 | 101,962
Gross Unrealized Losses |  |
Less than 12 Months | 3 | 4,973
12 Months or Longer | 20,826 | 12,219
Total | $ 20,829 | $ 17,192
Number of Securities | security | 16 | 16
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 86,964 | $ 1,177,104
12 Months or Longer | 886,092 | 108,652
Total | 973,056 | 1,285,756
Gross Unrealized Losses |  |
Less than 12 Months | 10,369 | 150,096
12 Months or Longer | 233,868 | 28,630
Total | $ 244,237 | $ 178,726
Number of Securities | security | 743 | 946
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 11,273 | $ 182,700
12 Months or Longer | 408,686 | 325,455
Total | 419,959 | 508,155
Gross Unrealized Losses |  |
Less than 12 Months | 453 | 16,910
12 Months or Longer | 116,114 | 83,448
Total | $ 116,567 | $ 100,358
Number of Securities | security | 164 | 177
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 0 | $ 12,176
12 Months or Longer | 11,788 | 0
Total | 11,788 | 12,176
Gross Unrealized Losses |  |
Less than 12 Months | 0 | 807
12 Months or Longer | 1,141 | 0
Total | $ 1,141 | $ 807
Number of Securities | security | 10 | 10

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