This is the 3262nd most frequent Japanese word.
山口銀行
Yamaguchi Bank
山口銀行 is used as a proper noun referring to the financial institution.
山口銀行は資金提供の相談に乗ります。
The Yamaguchi Bank provides consultations on funding.
Here, 山口銀行 denotes the brand name of the bank associated with the card I own.
私は山口銀行のカードを持っています。
I possess a card from Yamaguchi Bank.
In this context, 山口銀行 indicates the host organization for the mentioned internship.