Why would who want to target Iraqi public sector banks?

Two suicide bombers detonated cars laden with explosives outside the Trade Bank of Iraq, ...one of the public sector's most active financial institutions and at the forefront of efforts to encourage foreign investment..., killing 26 people in the latest attack to raise concerns about the nation's stability after an inconclusive election.

A week earlier, gunmen and suicide bombers laid siege to the central bank in Baghdad, killing 18 people and fueling fears that insurgents are trying to exploit a political vacuum that followed the March 7 election which produced no outright winner.

...Security officials blamed the June 13 central bank attack on Sunni Islamist insurgents linked to al Qaeda...

They said that attack was also an attempt to reignite violence between majority Shi'ites and once dominant Sunnis after the election, which has yet to produce a new government.

Reuters, June 20, 2010

If Gulf of Mexico oil production declines from regulatory intervention

and Middle East oil production declines via internal strife

and/or American/Israeli military strikes against Iran...?