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Only put in what is necessary for the plot. You develop the character so that the actions s/he takes make sense for the plot. If the character reveals something about his/her past, there should be...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/28504 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/28504 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Only put in what is necessary for the plot. You develop the character so that the actions s/he takes make sense for the plot. If the character reveals something about his/her past, there should be a plot-related reason for it. (That reason might be another character's reaction, or how it furthers a relationship, but there has to be a reason.) Otherwise, keep it in your slush file and read it to yourself if it makes you happy. But don't clutter up your manuscript if it's not relevant.