Amãna Bank is the first and only licensed commercial bank in Sri Lanka to conduct all its operations under the principles of Islamic banking and be fully disengaged from interest based transactions, offering the full spectrum of retail banking, SME banking, corporate banking, treasury and trade finance services.ANA BANK. Amãna Bank is the ­first and only Licensed Commercial Bank in Sri Lanka to conduct all its operations under the principles of Islamic banking and be fully disengaged from interest based transactions, offering the full spectrum of Retail Banking, SME Banking, Corporate Banking, Treasury and Trade Finance Services.