Flypaper (2011) http://www.imdb.com/title/tt1541160/
When Tripp goes to the bank he gets caught in the middle of two bank robberies. Two different teams decided to rob the bank at the same time. During the ensuing stand-off between the teams Tripp overhears parts of their conversations and mediates a solution. One team goes for the vault, the other team robs the ATMs. The robbers move all the hostages in to a room, but events begin to unravel everyone's plans.
This is more like a bottled-up caper film. Bottled up because we don't leave the bank until the very end. A caper film because we find out there's a bit more going on behind the scenes and an explanation as to why the two teams decided to rob the same bank at the same time. The mystery component comes about as Tripp begins to piece together, not entirely accurately, what is going on. The humor (comedy) component comes about from situational absurdity, characters and some dialog. There is some gun-shootin, some blowing-up stuff, some violence and deaths.
And, like any decent caper film, there is quite a cast of recognizables including Patrick Dempsey, Ashley Judd, Tim Blake Nelson, Mekhi Phifer, Jeffrey Tambor, Pruitt Taylor Vince. Even if you don't recognize some of the names you'll surely recognize the faces.
It's not as complex a caper film as, say, the "Oceans 11" series or "The Italian Job", but it does have its bits. The biggest difference is that most caper films tell you the goal then show you the planning stages, whether or not it goes to plan or there's a plan within a plan. This one slowly reveals what the plan was and by who as events unfold.
Decent enough film, should work for light comedy night or even bank-robbery night viewing.