Ljubljanska Banka was founded in 1955, as Yugoslavia evolved from its strict
monobank system of the early 1950s. It opened an office in
Zagreb in 1969, and also established affiliates in
Sarajevo and
Skopje. In the 1980s, it was one of nine so-called associated banks that formed the backbone of the commercial banking sector in Yugoslavia, together with
Beogradska Banka and
Jugobanka in Belgrade,
Vojvođanska Banka in Novi Sad,
Kosovska Banka in Pristina,
United Bank of Croatia in Zagreb,
Privredna Banka Sarajevo,
Stopanska Banka in Skopje, and
Investment Bank Titograd. In late 1989, the Ljubljanska Banka group underwent legal restructuring. On , the group's parent entity was re-registered as a joint stock company, with effect on . On , the Zagreb affiliate was re-registered as a branch of the Ljubljana-based group, with effect on . As part of the restructuring, some regional operations within Slovenia were also separated from NLB. This led to the establishment of
Gorenjska Banka, headquartered in
Kranj, as a separate financial institution in 1996. ==Croatian–Slovenian dispute==