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Investments - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Investments, Debt and Equity Securities [Abstract]      
Vertical risk retention interest 5.00%    
Trading investments $ 53,732   $ 53,262
Number of government sponsored securities with unrealized losses | security 217   236
Number of mortgage-backed securities | security 280   278
Par value of mortgage-backed securities pledged to FRB $ 639,000   $ 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 79,000   82,000
Liability for unfunded commitments 28,000   $ 30,000
Low income housing tax credit investments, tax credits and benefits (less than) $ 1,000 $ 13,000  
Low income housing tax credit investments, expected tax benefits recognized 25.00%