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INVESTMENT SECURITIES - Investment securities in a continuous unrealized loss position (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
position
Dec. 31, 2023
USD ($)
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 88,006 $ 72,127
12 months or longer 2,711,396 2,720,541
Total 2,799,402 2,792,668
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 1,676 933
12 months or longer 422,633 382,227
Total 424,309 383,160
Fair Value    
Less than 12 Months 595,656 555,836
12 Months or Longer 505,051 522,743
Total 1,100,707 1,078,579
Gross Unrealized Losses    
Less than 12 Months 29,608 16,111
12 Months or Longer 56,726 34,935
Total 86,334 51,046
Available-for-sale, allowance for credit losses 0  
Accrued interest receivable on available-for-sale debt securities $ 11,600  
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 2,055,517 2,080,783
Total 2,055,517 2,080,783
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 327,136 300,385
Total 327,136 300,385
Fair Value    
Less than 12 Months 527,314 536,885
12 Months or Longer 503,684 521,350
Total 1,030,998 1,058,235
Gross Unrealized Losses    
Less than 12 Months 28,776 15,953
12 Months or Longer 56,684 34,913
Total 85,460 50,866
Obligations of state and political subdivisions    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months 85,364 63,541
12 months or longer 313,287 287,191
Total 398,651 350,732
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 1,635 878
12 months or longer 35,829 29,107
Total 37,464 29,985
Government agency mortgage-backed securities    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months 2,642 8,586
12 months or longer 326,890 336,266
Total 329,532 344,852
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 41 55
12 months or longer 58,546 51,557
Total 58,587 51,612
Fair Value    
Less than 12 Months 68,342  
12 Months or Longer 1,367  
Total 69,709  
Gross Unrealized Losses    
Less than 12 Months 832  
12 Months or Longer 42  
Total $ 874  
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 7,440 7,394
Total 7,440 7,394
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 560 606
Total 560 606
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 8,262 8,907
Total 8,262 8,907
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 562 572
Total $ 562 572
Fair Value    
Less than 12 Months   18,951
12 Months or Longer   1,393
Total   20,344
Gross Unrealized Losses    
Less than 12 Months   158
12 Months or Longer   22
Total   $ 180