There are some clear trends to be observed in the results of banks ranging from the trillion-dollar Citigroup to pint-sized regional banks such as BankAtlantic Bancorp (NYSE: BBX). Fools should absolutely pay attention.

Coming back strong
While the U.S. economy is still building a slow sense of momentum, American banks, with some clear-cut encouraging trends, already seem to be on the right track. And the most apparent one has been a decline in provisions for loan losses (PLL).

As I observed in my study of the banks' recent earnings, a whole bunch of banks have experienced a significant improvement in their credit portfolios, which subsequently led to an improvement in their first-quarter earnings. Allowance for loan loss has shown an improving trend in the last couple of years but gained impetus in this quarter.

The behemoths
Big banks have led the way in this trend. Citigroup's provision for loan losses has been declining steadily over the last few quarters. It declined to $2.9 billion this quarter, compared with $8.4 billion in the first quarter of 2010 and $4.6 billion in the preceding quarter -- significant improvements in credit quality across consumer and commercial portfolios.

Similarly, Bank of America (NYSE: BAC) managed to pull off a quarterly profit after posting losses for two consecutive quarters as its provision for loan losses went down to $3.8 billion from $9.8 billion in the year-ago quarter. JPMorgan (NYSE: JPM) also saw a drop in its consumer net charge-off and nonperforming assets.

The regional banks
The larger trend has not been restricted to big banks. Apart from improvement in their asset and credit quality, regional banks such as KeyCorp and BankAtlantic Bancorp also experienced lower credit costs. Even regional banks incurring net losses in the quarter also managed to join the group. Flagstar Bancorp and Hudson City Bancorp (Nasdaq: HCBK) posted net losses, but low market interest rates fueled loan repayments, thereby resulting in an improvement in PLL.

Not just America
Interestingly, it wasn't only American financials that have benefited from a cutback in PLL. Declining provisions for credit losses and a goodwill impairment charge last year enabled Canadian banks such as Royal Bank of Canada (NYSE: RY) and Bank of Montreal (NYSE: BMO) to fall in line as well. In fact, the trend was observed in European countries, too. Spanish giant Banco Santander (NYSE: STD) and the U.K.'s biggest bank, HSBC, also benefited from lower provisions and loan losses.

The Foolish bottom line
An upsetting trend observed during the quarter was the bleakish domestic loan growth, and this may become a bottleneck in the lending business in the United States. But on the whole, things are improving for the banking industry, which was battered and bruised during the economic fiasco. I see this trend continuing and improving in the forthcoming quarters, complemented by the gradually reviving larger economy. Fools may wish to consider investing in well-run banks.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.