Bankers Trust Co. earned $37 million in 2015, a 12.4 percent increase from the previous year, according to a release. With assets of almost $4 billion, the Des Moines-based bank ranks among the top 250 by size in the United States. Loans increased $285 million for the year, a 10.3 percent increase, and deposits rose 8.7 percent to $2.9 billion. “Due to another solid year, we proudly increased our philanthropic giving to support the communities we serve,” President and CEO Suku Radia said in the release. “We invested $1.3 million over the past 12 months, which is the highest amount in the Bank’s nearly 100-year history.”