Pengaruh bank size, gearing ratio, non performing loan, asset management, operating efficiency, dan capital adequacy ratio terhadap profitabilitas (ROA dan ROE) bank umum tahun 2008-2015 = The effect bank size, gearing ratio, non performing loan, asset management, operating efficiency, and capital adequacy ratio to profitability (ROA and ROE) conventional banks for the period of 2008-2015