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INVESTMENT SECURITIES - Investment securities in a continuous unrealized loss position (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
position
Dec. 31, 2023
USD ($)
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 66,996 $ 72,127
12 months or longer 2,704,799 2,720,541
Total 2,771,795 2,792,668
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 1,541 933
12 months or longer 431,469 382,227
Total 433,010 383,160
Fair Value    
Less than 12 Months 114,305 555,836
12 Months or Longer 1,028,290 522,743
Total 1,142,595 1,078,579
Gross Unrealized Losses    
Less than 12 Months 1,518 16,111
12 Months or Longer 102,179 34,935
Total 103,697 51,046
Available-for-sale, allowance for credit losses 0  
Accrued interest receivable on available-for-sale debt securities $ 14,000  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable  
U.S. Treasury and agency securities    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 0 0
12 months or longer 2,056,048 2,080,783
Total 2,056,048 2,080,783
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 329,145 300,385
Total 329,145 300,385
Fair Value    
Less than 12 Months 0 536,885
12 Months or Longer 1,021,783 521,350
Total 1,021,783 1,058,235
Gross Unrealized Losses    
Less than 12 Months 0 15,953
12 Months or Longer 102,042 34,913
Total 102,042 50,866
Obligations of state and political subdivisions    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months 65,434 63,541
12 months or longer 317,221 287,191
Total 382,655 350,732
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 1,524 878
12 months or longer 41,212 29,107
Total 42,736 29,985
Government agency mortgage-backed securities    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months 1,562 8,586
12 months or longer 316,377 336,266
Total 317,939 344,852
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 17 55
12 months or longer 60,084 51,557
Total 60,101 51,612
Fair Value    
Less than 12 Months 114,305 18,951
12 Months or Longer 6,507 1,393
Total 120,812 20,344
Gross Unrealized Losses    
Less than 12 Months 1,518 158
12 Months or Longer 137 22
Total $ 1,655 180
Corporate debt securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Total | position 2  
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 0 0
12 months or longer 7,497 7,394
Total 7,497 7,394
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 503 606
Total 503 606
Government agency collateralized mortgage obligations    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months 0 0
12 months or longer 7,656 8,907
Total 7,656 8,907
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 525 572
Total $ 525 $ 572