The arrest is part of an investigation prompted by a report from an unnamed high street bank that online accounts had been compromised over an 18-month period.
The PCeU found that accounts had been accessed without authority, money stolen and personal details had been changed.
"Online crime is never victimless. Such offences are indiscriminate and will be fully investigated where allegations are made." Detective Inspector Mark Raymond at the PCeU said.
"Online banking is generally very safe providing individuals keep their operating systems and anti-virus software regularly updated to avoid online hackers and fraudsters. Sound independent advice can be found at 'getsafeonline.org'."
