v3.26.3
Investment Securities - Summary of Held-to-maturity Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 878,309 $ 923,073
Allowance for Credit Losses (233) (236)
Gross Unrealized Gains 73 5,733
Gross Unrealized Losses (111,723) (60,856)
Fair Value 766,426 867,714
U.S. government sponsored agencies    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 261,616 261,826
Allowance for Credit Losses 0 0
Gross Unrealized Gains 22 740
Gross Unrealized Losses (24,860) (8,131)
Fair Value 236,778 254,435
States and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 138,405 140,843
Allowance for Credit Losses (233) (236)
Gross Unrealized Gains 26 77
Gross Unrealized Losses (34,029) (25,027)
Fair Value 104,169 115,657
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 381,224 423,628
Allowance for Credit Losses 0 0
Gross Unrealized Gains 25 4,916
Gross Unrealized Losses (35,361) (15,421)
Fair Value 345,888 413,123
Commercial mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 97,064 96,776
Allowance for Credit Losses 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (17,473) (12,277)
Fair Value $ 79,591 $ 84,499