Union Bank Bank Account Or Service Complaint

Union Bank Bank account or service department,

Checking account Deposits and withdrawals California

Recently, I deposited a check from my - - account to my Union Bank account. The day after funds transfered to Union Bank I noticed my funds were on only partially credited to my checking account. A Union Bank branch manager told me that the partial credit would be on hold for 2 - 3 days after funds transfered in. How many days does Union Bank legally have to hold client funds once the transfer has been credited to thier ledger?