To round off the Deposited Banked Hrs by 0.25 difference in the Banked Time Details report, use the following formula to create a new custom column under the report settings,

if((DepositedBankedHours-Floor(DepositedBankedHours))<=0.25,Floor(DepositedBankedHours)+0.15,if((DepositedBankedHours-Floor(DepositedBankedHours))>=0.25 && (DepositedBankedHours-Floor(DepositedBankedHours))<=0.5,Floor(DepositedBankedHours)+0.30,if((DepositedBankedHours-Floor(DepositedBankedHours))>=0.5 && (DepositedBankedHours-Floor(DepositedBankedHours))<=0.75,Floor(DepositedBankedHours)+0.45,if((DepositedBankedHours-Floor(DepositedBankedHours))>=0.75 && (DepositedBankedHours-Floor(DepositedBankedHours))<=0.99,Floor(DepositedBankedHours)+1,0))))