Two regional banks emerged as winners last year as deposit runs shook their industry. Their fortunes have diverged since: New York Community Bancorp Inc. required a frantic rescue last month. First Citizens BancShares Inc. has stretched its rally to more than double in value.
But behind the scenes, even the stock-market winner has to deal with the growing pains that have come to define a group of lenders big enough to warrant greater scrutiny from watchdogs, yet still far smaller than their megabank rivals.
