When they get done spawning they start getting ready for next years spawn - that's their one purpose in life. It depends on how difficult the spawn was for them, how close comfortable quarters and a steady food supply are to where they spawn, just how far they move and how aggressive they are likely to be. We find them on the same staging beds they are on before and during the spawn for a month or two after the spawn is over. In areas where shallow spawning coves are close to deep water that may be just a few yards from where they spawn.
In years where the threadfin shad populations are low and/or we have very unstable weather conditions and lake levels the crappie will be quite thin when they come off the spawn and very aggressive until they get some weight back on. When they have a fairly easy spawn, which is very seldom, they won't be as thin or as aggressive in the post spawn period.
"After they hit the banks and are pretty much done" may be a difficult time to pinpoint. Crappie will tend to spawn deeper as the water warms up and/or clears up. It's easy to make the mistake of thinking the spawn is over when you're not finding them in real shallow water where they've been spawning for several weeks. If you'll move back to slightly deeper water and fish around any available cover you may find crappie spawning a lot later than you would expect. We usually think of these areas as staging beds, where crappie, especially the females hang out while they are "getting in the mood". But as the water temps get too warm in the shallows, which may also coincide with the water clearing up some, they'll spawn around or on this cover in deeper water.
By checking the egg supply and the condition of the eggs in the females we clean every day we can get a pretty good idea whether they are still trying to spawn or not. But even when they are spawning we fish the staging areas more than we do the shallow areas. Partly because we are out there every day and don't want to disturb them too much while they are spawning but mostly because it's usually easier and more productive to fish the staging beds than the real shallow cover, especially if we have 4 or 5 people trying to fish out of the same boat.