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Investment Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost $ 1,271,901 $ 1,277,209    
Allowance for Credit Losses (2,005) (2,005) $ (2,005) $ (2,005)
Net Carrying Amount 1,269,896 1,275,204    
Gross Unrealized Gains 92 39    
Gross Unrealized (Losses) (116,726) (132,303)    
Estimated Fair Value 1,153,262 1,142,940    
U.S. government-sponsored enterprises        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 43,629 43,560    
Allowance for Credit Losses 0 0    
Net Carrying Amount 43,629 43,560    
Gross Unrealized Gains 0 0    
Gross Unrealized (Losses) (2,249) (3,021)    
Estimated Fair Value 41,380 40,539    
U.S. government-sponsored mortgage-backed securities        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 122,617 124,169    
Allowance for Credit Losses 0 0    
Net Carrying Amount 122,617 124,169    
Gross Unrealized Gains 66 0    
Gross Unrealized (Losses) (4,509) (6,695)    
Estimated Fair Value 118,174 117,474    
State and political subdivisions        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 1,105,655 1,109,480    
Allowance for Credit Losses (2,005) (2,005)    
Net Carrying Amount 1,103,650 1,107,475    
Gross Unrealized Gains 26 39    
Gross Unrealized (Losses) (109,968) (122,587)    
Estimated Fair Value $ 993,708 $ 984,927