Federal regulators and industry analysts raised concerns that defaults would spike once pre-crisis home-equity lines of credit hit their amortization periods. Those fears didn’t come to pass as vintage HELOCs have performed well, thanks to home-price appreciation and low interest rates. Pre-crisis HELOCs typically had interest-only periods for the first 10 years then switch to fully amortizing or required a full payment as part of a balloon feature. According to a 2015 report by the Office of the Currency ...