In 1952, he married Catharine Maclary of Milton, Mass.
"They met in church holding a hymnal. He recognized her Wellesley ring," said his daughter Janet Stewart Blynn. Ever after, he would say: "Keep going to church because you never know who you're going to hold a hymnal with."
The two moved to Wayne, where they lived for 43 years and raised a family.
In 1954, Mr. Stewart joined the trust department of Fidelity Bank in Philadelphia. He settled estates and administered trusts, becoming a vice president in 1978. He retired in 1990.
He handled many of the old Main Line family estates. His family described him as "highly regarded and a valued employee of Fidelity for 36 years."
While with the bank on South Broad Street, Mr. Stewart, a collector, would display his treasures - optical items or campaign buttons, whatever was timely - in a glass case in the lobby for visitors and bank workers to enjoy. "It was amazing, legendary," his daughter said of the display.
Mr. Stewart served as a community volunteer throughout his life. He was a member of the Radnor Township School District Board of Directors, treasurer for the Radnor Historical Society in Wayne, and judge of elections in Radnor's First Ward.
He was a member of the Sons of the American Revolution and the St. Andrew's Society of Philadelphia, and a Mason. He also served as an elder of Great Valley Presbyterian Church, in Tredyffrin, and as a trustee of Eastern University for 29 years ending in 2003.
Besides his wife and daughter, Mr. Stewart is survived by a son, David Maclary Stewart, and four grandchildren.
Services were private.
Donations may be made to ACTS Mission Foundation, Box 90, 375 Morris Rd., West Point, Pa. 19486.