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INVESTMENT SECURITIES - Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
position
Dec. 31, 2022
USD ($)
position
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 350 1,149
12 months or longer | position 1,267 430
Total | position 1,617 1,579
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 176,969 $ 1,955,294
12 months or longer 2,584,226 2,106,692
Total 2,761,195 4,061,986
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 12,956 188,107
12 months or longer 534,249 336,081
Total $ 547,205 $ 524,188
Number of positions    
Less than 12 Months | position 39 23
12 Months or Longer | position 0 0
Total | position 39 23
Fair Value    
Less than 12 Months $ 990,660 $ 1,034,795
12 Months or Longer 0 0
Total 990,660 1,034,795
Gross Unrealized Losses    
Less than 12 Months 134,880 44,900
12 Months or Longer 0 0
Total 134,880 $ 44,900
Available-for-sale, allowance for credit losses 0  
Accrued interest receivable on available-for-sale debt securities $ 11,800  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable  
Accrued interest and fees receivable $ 2,900  
U.S. Treasury and agency securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 0 41
12 months or longer | position 64 61
Total | position 64 102
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 0 $ 1,384,075
12 months or longer 1,979,439 1,859,462
Total 1,979,439 3,243,537
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 132,511
12 months or longer 399,168 284,498
Total $ 399,168 $ 417,009
Number of positions    
Less than 12 Months | position 23 23
12 Months or Longer | position 0 0
Total | position 23 23
Fair Value    
Less than 12 Months $ 967,588 $ 1,034,795
12 Months or Longer 0 0
Total 967,588 1,034,795
Gross Unrealized Losses    
Less than 12 Months 134,091 44,900
12 Months or Longer 0 0
Total $ 134,091 $ 44,900
Obligations of state and political subdivisions    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 285 582
12 months or longer | position 434 76
Total | position 719 658
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 165,835 $ 370,524
12 months or longer 263,067 47,923
Total 428,902 418,447
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 12,417 35,488
12 months or longer 59,976 9,839
Total $ 72,393 $ 45,327
Government agency mortgage-backed securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 65 497
12 months or longer | position 727 274
Total | position 792 771
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 11,134 $ 190,727
12 months or longer 325,079 189,919
Total 336,213 380,646
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 539 19,508
12 months or longer 73,479 40,606
Total $ 74,018 $ 60,114
Number of positions    
Less than 12 Months | position 16  
12 Months or Longer | position 0  
Total | position 16  
Fair Value    
Less than 12 Months $ 23,072  
12 Months or Longer 0  
Total 23,072  
Gross Unrealized Losses    
Less than 12 Months 789  
12 Months or Longer 0  
Total $ 789  
Corporate debt securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 0 0
12 months or longer | position 2 2
Total | position 2 2
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 0 $ 0
12 months or longer 7,174 7,114
Total 7,174 7,114
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 826 886
Total $ 826 $ 886
Government agency collateralized mortgage obligations    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 0 29
12 months or longer | position 40 17
Total | position 40 46
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 0 $ 9,968
12 months or longer 9,467 2,274
Total 9,467 12,242
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 600
12 months or longer 800 252
Total $ 800 $ 852