In a speech outlining the next stage of Nigeria's banking reforms, Central Bank Gov. Lamido Sanusi on Thursday questioned the universal banking model and said an obsession with rapid growth without the right frameworks to manage risk had been at the heart of last year's problems.

He voiced confidence that the reforms would continue after Vice President Goodluck Jonathan took over as acting president this week and dismissed rumors a committee had been set up to review the central bank's powers.

"The question we are asking ourselves is must every bank compete in the same space, must every bank be an international bank. Can we not have regional banks, can we not have specialized banks," Sanusi told a banking conference in Lagos.

"What we are doing now is categorizing banks and we will come out with different capital requirements for the banks." The move could change the landscape of Nigerian banking, until now characterized by swollen institutions concerned primarily with outstripping their rivals' asset growth at the expense of creating loans and growing their business.

Sanusi said regulatory shortfalls, including at the central bank, had allowed liquidity to flow into capital markets at the expense of the real economy in the run-up to last year's crisis.

"Do we not need to look again at the universal banking model?" Sanusi asked the conference.

"Should banks use depositors' funds for their own proprietary trading, should they risk depositors' funds for private equity, should they use depositor's funds for venture capital or should they risk their own funds?" he added.

Sanusi said the central bank would pursue a "hybrid" monetary policy with the twin aims of targeting single-digit inflation - at 12 percent in December - as well as seeking to avoid a repeat of the sort of asset bubble which led to last year's crisis.

Part of that financial stability would be achieved through tighter regulation of risk management in the banking sector but also by stabilizing government revenues, which are largely dependent on oil.

Sanusi said the central bank was working with the Finance Ministry on developing the use of market instruments to hedge against oil price volatility.

Sanusi's bailout last year of nine institutions found to be so weakly capitalized that they posed a systemic risk sent a shockwave through sub-Saharan Africa's second biggest economy.

He said the central bank had received expressions of interest for all of the banks rescued in last year's bailout, including three or four from foreign investors.

Legislation would be passed in coming weeks to create an asset management company to recover bad bank loans, Sanusi said.

He said the company would need 1 trillion naira to buy up all the bad loans in the system, adding around 0.2 percent to the budget deficit, and would recover around half that amount.