Yes it is OK to show your foreign mortgage interest on line 10. Just be aware that if the IRS tries to match up your information with what the IRS has collected from the bank and there is no Form 1098, it may cause the IRS to question this interest deduction. If you are contacted by the IRS, you will just need to provide an explanation of your situation (that your mortgage interest is from a foreign bank and provide the IRS with the details of this loan).
[edited 1/19/2017]
