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Investments - Narrative (Details)
$ in Thousands
 6 Months Ended 9 Months Ended
Jun. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Investments, Debt and Equity Securities [Abstract]      
Vertical risk retention interest 5.00%    
Trading investments $ 49,600   $ 53,262
Number of government sponsored securities with unrealized losses | security 230   236
Number of mortgage-backed securities | security 285   278
Par value of mortgage-backed securities pledged to FRB $ 657,000   $ 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 76,000   82,000
Liability for unfunded commitments 27,000   $ 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%