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The posture you mention, as well as the "steepled fingers" posture, is one of authority and evaluation.  Mr. Spock would adopt one of those poses when taking a report from an ensign.  :- )
The presence of the table you're sitting at --- > warps a lot of body language that would be different when standing, or when sitting in a comfortable sofa... 
Chessplayers often use a "laced fingers" posture, sometimes resting the chin on the hands, because it removes the distraction of having fingers at all.  :- )  The hands can rest quietly for long periods of time and as the palms face inward, you can "cocoon" yourself into a posture of deep contemplation.
Body language can be complicated and controversial but it's funny you should mention your "bang the gavel" role with such a classically-authoritative posture... your natural posture in this case is probably serving you well, conveying an *unconscious* level that you are the right person to be directing the discussion.
Or not :- )