Nashville’s pool of available deposits surged during the past decade, newly released federal data shows. Since 2010, the region’s amount of available deposits has grown by 66% — to $64.1 billion, up from $38.5 billion, according to the Federal Deposit Insurance Corp. It’s yet another metric to help quantify just how rapidly the region’s economy is expanding. For the second year in a row, Nashville-based Pinnacle Bank (Nasdaq: PNFP) topped the annual ranking of which banks control the most market share.