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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost $ 1,282,591 $ 1,283,987    
Allowance for Credit Losses (2,005) (2,005) $ (2,005) $ (2,005)
Net Carrying Amount 1,280,586 1,281,982    
Gross Unrealized Gains 216 562    
Gross Unrealized (Losses) (121,657) (112,063)    
Estimated Fair Value 1,159,145 1,170,481    
U.S. government-sponsored enterprises        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 43,353 43,285    
Allowance for Credit Losses 0 0    
Net Carrying Amount 43,353 43,285    
Gross Unrealized Gains 0 0    
Gross Unrealized (Losses) (3,342) (2,607)    
Estimated Fair Value 40,011 40,678    
U.S. government-sponsored mortgage-backed securities        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 129,077 130,278    
Allowance for Credit Losses 0 0    
Net Carrying Amount 129,077 130,278    
Gross Unrealized Gains 0 106    
Gross Unrealized (Losses) (6,093) (4,362)    
Estimated Fair Value 122,984 126,022    
State and political subdivisions        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 1,110,161 1,110,424    
Allowance for Credit Losses (2,005) (2,005)    
Net Carrying Amount 1,108,156 1,108,419    
Gross Unrealized Gains 216 456    
Gross Unrealized (Losses) (112,222) (105,094)    
Estimated Fair Value $ 996,150 $ 1,003,781