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Investment Securities - Bond Ratings (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,282,591 $ 1,283,987
Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 278,435  
Aa/AA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 845,485  
A    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 27,686  
Not rated    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,908  
Agency Backed    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 129,077  
State and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,110,161 1,110,424
State and political subdivisions | Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 235,082  
State and political subdivisions | Aa/AA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 845,485  
State and political subdivisions | A    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 27,686  
State and political subdivisions | Not rated    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,908  
State and political subdivisions | Agency Backed    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored enterprises    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 43,353 $ 43,285
U.S. government-sponsored enterprises | Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 43,353  
U.S. government-sponsored enterprises | Aa/AA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored enterprises | A    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored enterprises | Not rated    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored enterprises | Agency Backed    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Other Security Investments [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 129,077  
Other Security Investments [Member] | Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Other Security Investments [Member] | Aa/AA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Other Security Investments [Member] | A    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Other Security Investments [Member] | Not rated    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Other Security Investments [Member] | Agency Backed    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 129,077