Offshore Banking is a result of waves offshore from a beach. The swirling turbulence of waves breaking off a beach excavates a trough in the sandy bottom. Some of this sand is carried forward onto the beach and the rest is deposited on the offshore flank of the trough. Sand suspended in the backwash and in rip currents adds to the bank, as does some sand moving shoreward from deeper water. The offshore bank's top is kept below still-water (half-wave height) level by the plunge of the waves breaking over it. Banks/bars and troughs are most pronounced in the heavy surf of the stormy season; they also migrate shoreward in gentle seas and seaward in high seas. Thus, although offshore banks have greatest relief in the stormy season, they are more submerged.
Hope this helps.