Analysts said the mortgage rate reductions came as market interest rates have already gone up after factoring in expectations of a key rate raise.

Also responsible was the BOK head's remark made in a new conference after the rate-setting meeting that "The central bank will carefully judge whether to adjust the key rate additionally," they pointed out.

In light of those factors, local banks are unlikely to raise mortgage rates by as much as the base rate for the time being, they added.

"On the bond market, expectations of a key rate hike have already been reflected in market rates twice, which may go south gradually down the road," said Park Jong-yeon, an NH Investment & Securities analyst.

Over the long haul, however, watchers forecast bank mortgage and other lending rates to climb as the central bank is widely expected to carry out three rate hikes next year.

Their prediction is based on such factors as a steady recovery in the South Korean economy, a government drive to rein in property prices and snowballing household debt, and monetary tightening in the United States and other advanced economies.

"Thursday's rate hike signals the start of additional increases down the road, which will inevitably have an impact on bank lending rates linked to the benchmark rate," said Park Sung-wook, a researcher at the Korea Institute of Finance.

Buoyed by resilient exports, the nation's gross domestic product rose 1.4 percent on-quarter in the July-September period or by 3.6 percent compared with the previous year. South Korea's household debt hovers above 1,400 trillion won, a perennial bugbear for policymakers. (Yonhap)