Some big swings in mortgage banking profitability yielded an unexpected $4.31 billion bonanza for commercial banks and thrifts in the first quarter of 2018. According to call-report data analyzed by Inside Mortgage Trends, the industry’s mortgage banking was up 38.0 percent from the prior period. Several key banks reported gigantic increases, including Wells Fargo’s 170.0 percent jump to $1.22 billion and Bank of America’s 214.1 percent surge to ... [Includes one data chart]