PT Bank Tabungan Negara (Persero) Tbk (lit. "State Savings Bank"), trading as Bank BTN, is an Indonesian commercial bank best known as a mortgage bank, headquartered in Gambir, Jakarta.Founded in 1897 by the government of the Dutch East Indies as a post office savings bank, its products include banks accounts (savings, current, and fixed deposit), loans (personal, business, and mortgage loans—the latter being its most popular offering since its introduction in the 1970s) and Sharia-compliant banking services.