When it comes to the amount of auto loans they've recentlyoriginated, some banks have apparently stalled out.

According to data from tracking firm SNL Financial, the top 100lenders increased their total auto loans by just 0.64% over the fourth quarter of 2012. Amongthese, the top 16 lenders didn't budge from their spots compared toa quarter earlier.

Ally Financial Inc., the nation's top auto lending leader,witnessed a 6.73% drop in its auto loan portfolio in the firstquarter with loans decreasing to $60.41 billion from $64.77 billionat year-end 2012, SNL Financial said this week.

General Electric Capital Corp. came in second place withnegative growth at 6.12%. Other banks such as U.S Bancorp., FifthThird Bancorp., SunTrust Banks, BMW Bank of North America and StateFarm Bank BSB also experienced negative growth from the fourthquarter of 2012 to March 31, according to SNL Financial.

Meanwhile, credit unions are still in the midst of record autoloan growth. The latest data from CUNA Mutual Group's CreditUnion Trends Report showed a 7.5% annual gain stemming frompositive contributions from both new and used vehicleportfolios.

At $183.5 billion vehicle loans represented 29.5% of all loansin April and accounted for almost 42% of all credit union loangrowth since April 2012, CUNA Mutual said.

SNL Financial ranked the $50 billion Navy Federal Credit Union 14th on its top 25 list of autolenders. The Vienna, Va.-based credit union posted $7.27 billion inauto loans at the end of the first quarter, up 5.15% from the endof 2012.

Higher member optimism about their personal finances and theeconomy helped Navy Federal book $753 million in consumer loanoriginations in May alone – the best month in the cooperative's80-year history, according to the credit union.

Other credit unions that made SNL Financial's top 25 autolenders list were the $7.2 billion Security Service FCU in San Antonio (ranked 18th) $16 billionPentagonFCU in Alexandria, Va.,(ranked 21st) and the $5.3 billionAlaska USA FCU in Anchorage (ranked 25th).