locating mortgage holder

[Lin Wellford]

A house in our area has been sitting since the owner died in 2014. In 2016, there was a fire of unknown origins that gutted the building. Now in 2016 the deceased owner is the only name listed on the public records. CoreLogic has paid the taxes since 2011, and the original mortgage was held by a bank that was absorbed by another bank in 2014 and that bank was subsequently taken over by yet another bank, but there seems to be no record of the mortgage holder now.  No signs of foreclosure at this point. Property is maintained slightly by ServiceLink. Any ideas on how to track down the bank or institution now holding title?