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INVESTMENT SECURITIES - Investment securities in a continuous unrealized loss position (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
position
Dec. 31, 2024
USD ($)
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 41,898 $ 55,087
12 months or longer 2,749,769 2,689,972
Total 2,791,667 2,745,059
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 1,041 1,068
12 months or longer 297,640 405,935
Total 298,681 407,003
Fair Value - Held-To-Maturity    
Less than 12 Months 20,696 149,742
12 Months or Longer 1,105,616 1,030,830
Total 1,126,312 1,180,572
Gross Unrealized Losses - Held-To-Maturity    
Less than 12 Months 112 2,027
12 Months or Longer 83,809 123,408
Total 83,921 125,435
Unrealized losses in provision for credit losses 0  
Available-for-sale, allowance for credit losses 0  
Accrued interest and fees receivable 8,500  
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 2,177,910 2,083,786
Total 2,177,910 2,083,786
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 218,906 305,422
Total 218,906 305,422
Fair Value - Held-To-Maturity    
Less than 12 Months 0 0
12 Months or Longer 1,077,346 1,015,549
Total 1,077,346 1,015,549
Gross Unrealized Losses - Held-To-Maturity    
Less than 12 Months 0 0
12 Months or Longer 83,632 123,194
Total 83,632 123,194
Obligations of state and political subdivisions    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months 41,792 47,144
12 months or longer 281,692 301,202
Total 323,484 348,346
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 1,040 847
12 months or longer 32,380 41,150
Total 33,420 41,997
Government agency mortgage-backed securities    
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months 106 7,943
12 months or longer 280,461 290,786
Total 280,567 298,729
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 1 221
12 months or longer 46,016 58,694
Total 46,017 58,915
Fair Value - Held-To-Maturity    
Less than 12 Months 20,696 149,742
12 Months or Longer 28,270 15,281
Total 48,966 165,023
Gross Unrealized Losses - Held-To-Maturity    
Less than 12 Months 112 2,027
12 Months or Longer 177 214
Total $ 289 2,241
Corporate debt securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions    
Debt securities, available-for-sale, unrealized loss Position, number of positions | position 1  
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 0 0
12 months or longer 4,875 7,697
Total 4,875 7,697
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 125 303
Total 125 303
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 4,831 6,501
Total 4,831 6,501
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 0 0
12 months or longer 213 366
Total $ 213 $ 366