Commercial banks and savings institutions continued to stockpile agency MBS during the second quarter of 2017 with a strong appetite for Fannie Mae and Freddie Mac pass-through securities. Total bank investment in residential MBS rose by $36.28 billion during the second quarter, lifting the industry’s aggregate portfolio to a record $1.799 trillion. Bank MBS holdings have risen steadily since the third quarter of 2014, growing by $264.07 billion over that period. In addition to those held-to-maturity and available-for-sale accounts, about a dozen banks held $16.34 billion of residential MBS in trading accounts. All of the growth has been...[Includes two data tables]