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Investment Securities - Bond Ratings (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,279,095 $ 1,283,987
Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 282,362  
Aa/AA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 845,788  
A    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 23,200  
Not rated    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,825  
Agency Backed    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 125,920  
State and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,109,685 1,110,424
State and political subdivisions | Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 238,872  
State and political subdivisions | Aa/AA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 845,788  
State and political subdivisions | A    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 23,200  
State and political subdivisions | Not rated    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,825  
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 43,490 $ 43,285
U.S. government-sponsored enterprises | Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 43,490  
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  
U.S. government-sponsored mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 125,920  
U.S. government-sponsored mortgage-backed securities | Aaa/AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored mortgage-backed securities | Aa/AA    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored mortgage-backed securities | A    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored mortgage-backed securities | Not rated    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
U.S. government-sponsored mortgage-backed securities | Agency Backed    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 125,920