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INVESTMENT SECURITIES - Amortized Cost of Investment Securities Held to Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Total $ 2,263,426 $ 2,287,372
Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 179,357  
Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 156,209  
Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 183,736  
Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 135,167  
A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 131,421  
A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 10,170  
A3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 10,120  
Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total 1,457,246  
State and municipal    
Schedule of Held-to-maturity Securities [Line Items]    
Total 1,114,874 $ 1,117,552
State and municipal | Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 108,774  
State and municipal | Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 156,209  
State and municipal | Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 183,736  
State and municipal | Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 135,167  
State and municipal | A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 131,421  
State and municipal | A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 10,170  
State and municipal | A3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 10,120  
State and municipal | Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total 379,277  
Other    
Schedule of Held-to-maturity Securities [Line Items]    
Total 1,148,552  
Other | Aaa    
Schedule of Held-to-maturity Securities [Line Items]    
Total 70,583  
Other | Aa1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Other | Aa2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Other | Aa3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Other | A1    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Other | A2    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Other | A3    
Schedule of Held-to-maturity Securities [Line Items]    
Total 0  
Other | Non-rated    
Schedule of Held-to-maturity Securities [Line Items]    
Total $ 1,077,969