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Investments - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Vertical risk retention interest 5.00%  
Trading investments $ 51,963 $ 53,262
Number of government sponsored securities with unrealized losses | security 196 236
Number of mortgage-backed securities | security 295 278
Par value of mortgage-backed securities pledged to FRB $ 646,000 $ 610,000
Equity securities without readily determinable fair value, downward price adjustment, annual amount 10,000  
Non-marketable securities investment 12,000 24,000
Low income housing tax credit investments 99,000 82,000
Liability for unfunded commitments 43,000 30,000
Low income housing tax credit investments, tax credits and benefits (less than) $ 2,000 $ 13,000
Low income housing tax credit investments, expected tax benefits recognized 25.00%