The Shonai Bank, Ltd. (株式会社 荘内銀行, Kabushikigaisha Shōnai Ginkō) is a Japanese regional bank that is headquartered in Tsuruoka, Yamagata Prefecture. The bank is relatively small, even among Japanese regional banks; it operates primarily in Yamagata, though it also operates branches in Sendai, Tomiya, Fukushima, Akita in neighboring prefectures, as well as in the capital of Tokyo. In a departure from traditional Japanese banking practices, Shogin, as the bank is also known, maintains full teller-supported services on the weekends and holidays at all its branches.