Nevertheless, customers appeared set to continue pulling out savings and by early on Monday its shares had more than halved in value since Thursday's close.
"I didn't initially panic but the more you watch the news and read you think maybe we ought to do it as well," said Barbara Williams, retired, as she stood in line with hundreds of others at the Oxford Circus branch in central London.
"We thought we would do what everyone else is doing. Rightly or wrongly it's a chance you can't take."
Fears have mounted that a run of withdrawals will exacerbate the lender's funding problems and force a fire sale of the business. The problems were triggered by the global credit crunch as banks, worried about exposure to dodgy U.S. mortgage debt, jacked up the price of lending to each other.
As the fallout threatened to have wider economic and political impact, British finance minister Alistair Darling said authorities would consider every option to solve the crisis.
"The franchise is broken -- the deposit franchise at least -- the run on the bank is happening as we speak and could see as much as 12 billion (pounds) of deposits withdrawn," said Mamoun Tazi, analyst at MF Global. "One way for this to stop is for the bank to be taken over."
The Newcastle-based bank provides one in 13 British home loans. The BoE, as lender of last resort, stepped in on Friday to offer emergency funding to ease its funding problems after it struggled to borrow in money markets.
The bank had not drawn on the emergency facility by Sunday, the government said.
News of the emergency funding line sent thousands of Northern Rock's 1.4 million savings customers rushing to branches and to the Internet for their money. Customers were estimated to have withdrawn about 1.5 billion pounds on Friday and Saturday.
Some reports said as much as 2 billion pounds has been withdrawn, which would represent about 8% of its deposits.
Government, banking and regulatory officials are monitoring the situation closely, trying to halt the run on withdrawals.
But there was an element of panic and frustration across the bank's 76 branches.
"I didn't sleep at all on Friday night. It's a lot of money and I was very distressed and my husband was as well," said Karen Dawson, 53, a lawyer who was among hundreds in line at the Oxford Circus branch after failing to access her account via the Web site and by telephone since the crisis broke.
More significant could be the reaction of postal account holders, however, who account for 10 billion pounds of the bank's 24 billion pounds of retail deposits.
"Your Money is Safe..."
Northern Rock Chief Executive Adam Applegarth sought to reassure customers that their savings were secure via a message posted on the company's Web site, www.northernrock.co.uk.
"Your money is safe with us and if you want some, or all of it back, then you are perfectly entitled to it. Whilst you may have to wait a little longer than usual to receive it, you will get it," Applegarth said in the message posted on Sunday.