Wells Fargo increased its residential servicing portfolio by a meager 2 percent in the second quarter but marked up the asset value of its mortgage servicing rights by a mouth-watering 18 percent, a clear sign that it feels comfortable about both improving delinquencies and higher interest rates. The nation’s largest lender/servicer was hardly alone among the nation’s megabanks, all of which reported higher market values on MSR remaining principal balances that were mostly unchanged. Bank of America reported...