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INVESTMENT SECURITIES - Amortized Cost of Investment Securities Held to Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Total $ 2,074,465 $ 2,184,497
Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 1,107,845  
Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 148,923  
Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 184,341  
Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 185,166  
A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 65,665  
A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 20,317  
Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total 362,208  
U.S. Government-sponsored agency securities    
Schedule of Held-to-maturity Securities [Line Items]    
Total 345,531 374,002
U.S. Government-sponsored agency securities | Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 345,531  
U.S. Government-sponsored agency securities | Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored agency securities | Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored agency securities | Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored agency securities | A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored agency securities | A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored agency securities | Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
State and municipal    
Schedule of Held-to-maturity Securities [Line Items]    
Total 1,085,921 1,099,201
State and municipal | Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 120,801  
State and municipal | Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 148,923  
State and municipal | Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 184,341  
State and municipal | Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 185,166  
State and municipal | A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 65,665  
State and municipal | A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 20,317  
State and municipal | Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total 360,708  
U.S. Government-sponsored mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Total 641,513 $ 709,794
U.S. Government-sponsored mortgage-backed securities | Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 641,513  
U.S. Government-sponsored mortgage-backed securities | Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored mortgage-backed securities | Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored mortgage-backed securities | Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored mortgage-backed securities | A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored mortgage-backed securities | A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
U.S. Government-sponsored mortgage-backed securities | Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Foreign investment    
Schedule of Held-to-maturity Securities [Line Items]    
Total 1,500  
Foreign investment | Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Foreign investment | Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Foreign investment | Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Foreign investment | Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Foreign investment | A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Foreign investment | A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Foreign investment | Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total $ 1,500