When the credit crisis struck last year, federal regulators pumped tens of billions of dollars into the nation's leading financial institutions because the banks were so big that officials feared their failure would ruin the entire financial system. Today, the biggest of those banks are even bigger. The crisis may be turning out very well for many of the behemoths that dominate U.S. finance. A series of federally arranged mergers safely landed troubled banks on the decks of more stable firms. And it allowed the survivors to emerge from the turmoil with strengthened market positions, giving them even greater control over consumer lending and more potential to profit. J.P. Morgan Chase ... now holds more than $1 of every $10 on deposit in this country. So does Bank of America, scarred by its acquisition of Merrill Lynch and partly government-owned as a result of the crisis, as does Wells Fargo, the biggest West Coast bank. Those three banks, plus government-rescued and -owned Citigroup, now issue one of every two mortgages and about two of every three credit cards, federal data show. Concerns are twofold: that consumers will wind up with fewer choices for services and that big banks will assume they always have the government's backing if things go wrong. That presumed guarantee means large companies could return to the risky behavior that led to the crisis if they figure federal officials will clean up their mess. The worry for consumers is that the bailouts skewed the financial industry in favor of the big and powerful. Fresh data from the FDIC show that big banks have the ability to borrow more cheaply than their peers because creditors assume these large companies are not at risk of failing.