A Queensland bank in the far north has called in the authorities to investigate the disappearance of more than $3 million as they also continue to look for the branch's manager who has been missing since the previous week.

Colin John Carleton, 55 years of age, has been missing since last week, Tuesday, when he left his house at around 8:30 in the morning aboard a red Honda motorcycle.

Mr. Carleton went missing a few days after Bendigo Bank initiated an internal investigation regarding the missing money amounting $3.1 million from Atherton branch, just a few clicks south from Cairns.

Bendigo Bank has employed the services of forensic investigators to examine "irregularities" at the Atherton branch, is currently analyzing the horde of transactions and accounts that occurred there.

Even though the authorities said there were no formal complaints were filed regarding the money that disappeared as of yet, Lauren Treacy, Bendigo's spokeswoman said they were discussing closely with the police.

"It is the bank's priority to gain a full understanding of what might have occurred and we will ensure - if our customers have been impacted - we will quickly take appropriate action," Ms Treacy stated.

"No customer will suffer a financial loss as a result of any inappropriate or criminal activity and the bank will meet with impacted customers as soon as possible."

According to the authorities, Mr. Carleton's failure to go back home or even to contact his family is very uncharacteristic of a man his stature, but the man hunt has been currently halted and State Emergency Service volunteers are put on stand by.

Mr. Carleton's family did not comment about the issue; however, Les Day, a close friend of his, stated they were going through very hard times.

"The whole town is devastated - absolutely shattered," Mr Day commented.

"It's just unbelievable. There's that many theories going around."

Mr. Day said he maintained close contact with Anne, Mr. Carleton's wife, and grown up children, Kelly, Megan, and Dan.

"He loved his family to death. He was always talking about them. This is just so out of character," Mr. Day remarked.

Mr. Carleton had been Atherton branch's manger for more than a decade and lived in the vicinity for most his adult life.

"He was the most popular man in Atherton."

Ms. Treacy adds that Bendigo's thoughts were with the Carletons, and they hoped with them that he would be found well and safe soon. She stated that until Mr. Carleton is not found, the authorities are "unable to take things any further".