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 Postspaarbank and relaunched in 1950, 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.