The $755 million System United Corporate Federal Credit Union said it added six new member credit unions – ranging in size from nearly $1 billion to less than $150,000 in assets – to its membership ranks in the past six months.

Member service, a no-fee line of credit and pricing on ACH processing that's better than that available from the Federal Reserve were cited as reasons for the moves, the Westminster, Colo.-based SunCorp said Thursday in a statement.

Shannon Pulkrabek, SunCorp sales and marketing assistant, would not disclose if the new members were required to contribute capital to join the corporate.

SunCorp said the new members are the $994 million Goldenwest Federal Credit Union in Ogden, Utah; the $494 million Warren Federal Credit Union in Cheyenne, Wyo.; the $260 million Partner Colorado Credit Union in Arvada, Colo.; the $68 million Latah Federal Credit Union in Moscow, Idaho; the $11 million Citco Federal Credit Union in Sheridan, Wyo.; and the $147,396 Tri-County Credit Union in Panguitch, Utah.

SunCorp reported 190 members as of Dec. 31, 2013, according to its 5310 report posted on the NCUA's website.