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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, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 188,767 | $ 1,423,379
12 Months or Longer | 1,457,365 | 487,129
Total | 1,646,132 | 1,910,508
Gross Unrealized Losses |  |
Less than 12 Months | 8,182 | 172,828
12 Months or Longer | 261,646 | 124,297
Total | $ 269,828 | $ 297,125
Number of Securities | security | 940 | 1,154
U.S. Treasury |  |
Fair Value |  |
Less than 12 Months | $ 1,130 | $ 2,459
12 Months or Longer | 961 | 0
Total | 2,091 | 2,459
Gross Unrealized Losses |  |
Less than 12 Months | 10 | 42
12 Months or Longer | 25 | 0
Total | $ 35 | $ 42
Number of Securities | security | 4 | 5
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 35,700 | $ 48,940
12 Months or Longer | 62,654 | 53,022
Total | 98,354 | 101,962
Gross Unrealized Losses |  |
Less than 12 Months | 3,056 | 4,973
12 Months or Longer | 14,466 | 12,219
Total | $ 17,522 | $ 17,192
Number of Securities | security | 16 | 16
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 126,594 | $ 1,177,104
12 Months or Longer | 947,564 | 108,652
Total | 1,074,158 | 1,285,756
Gross Unrealized Losses |  |
Less than 12 Months | 3,294 | 150,096
12 Months or Longer | 150,975 | 28,630
Total | $ 154,269 | $ 178,726
Number of Securities | security | 743 | 946
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 22,642 | $ 182,700
12 Months or Longer | 437,131 | 325,455
Total | 459,773 | 508,155
Gross Unrealized Losses |  |
Less than 12 Months | 1,523 | 16,910
12 Months or Longer | 95,292 | 83,448
Total | $ 96,815 | $ 100,358
Number of Securities | security | 167 | 177
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 2,701 | $ 12,176
12 Months or Longer | 9,055 | 0
Total | 11,756 | 12,176
Gross Unrealized Losses |  |
Less than 12 Months | 299 | 807
12 Months or Longer | 888 | 0
Total | $ 1,187 | $ 807
Number of Securities | security | 10 | 10

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