Dimensional Fund Advisors LP decreased its stake in NBT Bancorp Inc. (NASDAQ:NBTB) by 1.7% in the second quarter, according to the company in its most recent Form 13F filing with the Securities & Exchange Commission. The institutional investor owned 1,842,629 shares of the bank’s stock after selling 31,810 shares during the quarter. Dimensional Fund Advisors LP owned approximately 4.25% of NBT Bancorp worth $66,279,000 as of its most recent SEC filing. A number of other institutional investors and hedge funds also recently modified their holdings of the business. Russell Investments Group Ltd. grew its position in shares of NBT Bancorp…