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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Goodwill $ 241,222 $ 241,222
Additions 112,249 0
Balance at end of period 353,471 241,222
Total other intangible assets 198,339 17,461
Total goodwill and other intangible assets 551,810 258,683
Core deposits    
Goodwill [Roll Forward]    
Total other intangible assets 184,339 16,372
Trade name    
Goodwill [Roll Forward]    
Total other intangible assets 0 1,089
Customer relationships intangible asset    
Goodwill [Roll Forward]    
Total other intangible assets $ 14,000 $ 0