Yes, the full amount is deductible. Your mortgage interest is enough to trigger itemizing deductions ($12,000), so the total of all of your itemized deductions, including the mortgage interest, will be fully deductible for the tax year 2018 (or 2017).
For single filers, the maximum mortgage interest that is deductible for a single filer in 2017 is the interest on a loan of up to $1M of debt.
In 2018, it is the interest on a loan of up to $750K of new mortgage debt. Loans taken out prior to 2018 are grandfathered in at the $1M limit.
More details and special situations - https://turbotax.intuit.com/tax-tips/home-ownership/deducting-mortgage-interest-faqs/L4a9KF9mI
