Employees of Sampo Bank worked throughout the weekend to fix problems with its computer system which emerged when it was integrated with its new Danish parent company Danske Bank.
The account information of thousands of the bank's corporate clients was reworked in the bank's information systems.
According to Sampo Bank there had been "qualitative shortcomings" - mistakes - in the information received by Sampo's corporate clients concerning their accounts.
The companies could not be sure if the clients had paid their bills on time. This has led to a situation in which the companies' own bills may have been delayed, as there was no reliable information on what the real bank balance was.
Sampo Bank gave assurances that the payments have gone to the right places, but that there can be mistakes and delays in the information on them.
Sampo Bank head of communications Hannu Vuola said on Sunday that there probably still will be some problems in the bank's services this week, but that work was continuing to resolve them. He would not give a specific time when he expected the problems to be resolved.
Vuola also said that the online banking system has generally functioned without any serious problems.
