Secure and Fair Enforcement Banking Act of 2023 or the SAFE Banking Act of 2023 This bill provides protections for federally regulated financial institutions that serve state-sanctioned marijuana businesses. Currently, many financial institutions do not provide services to state-sanctioned marijuana businesses due to the federal classification of marijuana as a Schedule I controlled substance. Under the bill, a federal banking regulator may not penalize a depository institution for providing banking services to a state-sanctioned marijuana business. For example, regulators may not terminate or limit the deposit or share insurance of a depository institution solely because the institution provides financial services to a state-sanctioned marijuana business. The bill also prohibits a federal banking regulator from requesting or ordering a depository institution to terminate a customer account unless (1) the regulator has determined that the depository institution is engaging in an unsafe or unsound practice or is violating a law or regulation, and (2) that determination is not based primarily on reputation risk. Additionally, proceeds from a transaction involving activities of a state-sanctioned marijuana business are no longer considered proceeds from unlawful activity. (Financial institutions that handle proceeds from unlawful activity are subject to anti-money laundering laws. Violators of these laws are subject to fines and imprisonment.) Furthermore, a financial institution, insurer, or federal agency may not be held liable or subject to asset forfeiture under federal law for providing a loan, mortgage, or other financial service to a state-sanctioned marijuana business.