Idaho requires that you use the same filing status on your Idaho return that you use on your federal return. See page 4 of this reference: https://tax.idaho.gov/forms/EIN00046_12-12-2016.pdf
For most married couples, it is advantageous to file jointly rather than separately, especially when community property states are involved. This previous TT answer helps explain that: https://ttlc.intuit.com/questions/3462171-should-i-file-married-jointly-or-married-separately
Your likely best bet to file a joint federal and therefore a joint Idaho return.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
