Navy Federal Credit Union wants to know how their salary offering will compare to your previous employer. A hiring authority will have a budgetary range at which they'll bring on a new candidate. So, how well you answer this question will indicate your professional worth and how that might fit into their budget. Often, potential employers base your offer on what you are currently earning. Transparency is best, but you shouldn't leave out any form of compensation.
Before volunteering your current base earnings, start by sharing any bonuses or incentives, retirement packages, stock options, PTO, health/dental/vision, and any benefits you receive from your current employer. Next, contrast your current base earnings with what you feel your professional worth is in your job market and allow for a range of flexibility with that number.
Now is fair game to find out what they offer. Once you find where they're meeting, exceeding, or wanting in this regard, you can adjust your number accordingly. Be open, realistic, and honest. Transparency is the best choice when salary based questions arise.