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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