You'll have to contact the bank for its reason for restricting your account. However, it sounds like the bank has placed a short-term hold on the check deposit. Unless yours is a new account, the bank ought to have given you a notice of its hold on which will appear the length of the hold or the date on which the funds will be released to you. If that's not the bank's reason, your best approach is to ask them why funds are being withheld from you.
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