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Investments - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Vertical risk retention interest 5.00%  
Trading investments $ 58,166 $ 54,481
Number of government sponsored securities with unrealized losses | security 228 213
Number of mortgage-backed securities | security 258 248
Par value of mortgage-backed securities pledged to FRB $ 578,000 $ 612,000
Non-marketable securities investment 14,000 14,000
Low income housing tax credit investments 70,000 72,000
Liability for unfunded commitments 23,000 30,000
Low income housing tax credit investments, tax credits and benefits (less than) $ 1,000 $ 11,000
Low income housing tax credit investments, expected tax benefits recognized 25.00%