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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost $ 1,266,205 $ 1,277,209    
Allowance for Credit Losses (2,005) (2,005) $ (2,005) $ (2,005)
Net Carrying Amount 1,264,200 1,275,204    
Gross Unrealized Gains 444 39    
Gross Unrealized (Losses) (107,525) (132,303)    
Estimated Fair Value 1,157,119 1,142,940    
U.S. government-sponsored enterprises        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 43,770 43,560    
Allowance for Credit Losses 0 0    
Net Carrying Amount 43,770 43,560    
Gross Unrealized Gains 0 0    
Gross Unrealized (Losses) (1,523) (3,021)    
Estimated Fair Value 42,247 40,539    
U.S. government-sponsored mortgage-backed securities        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 118,662 124,169    
Allowance for Credit Losses 0 0    
Net Carrying Amount 118,662 124,169    
Gross Unrealized Gains 349 0    
Gross Unrealized (Losses) (3,366) (6,695)    
Estimated Fair Value 115,645 117,474    
State and political subdivisions        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 1,103,773 1,109,480    
Allowance for Credit Losses (2,005) (2,005)    
Net Carrying Amount 1,101,768 1,107,475    
Gross Unrealized Gains 95 39    
Gross Unrealized (Losses) (102,636) (122,587)    
Estimated Fair Value $ 999,227 $ 984,927