"You'll get your money back 10 years later" is not exactly "low risk" for any significant amount of money, even for a bank.
"SVB CEO and President Greg Becker "personally led" the bank's $500,000 lobbying efforts to reduce financial regulations on capital requirements and stress tests, according to the Accountable.US report." [0]
https://www.salon.com/2023/03/15/rolled-back-regulations-got...
A well run bank keeps some amount of assets in lots of different durations including longer terms, just not all at once.