Dude don't even think about X switches in Y years. Nobody cares about that anymore. Companies are doing multiple rounds of layoffs, why can't you switch multiple times if you think it's the right choice for you.
Also it is a great hike in this market and since it's a bank you will have a lot of work to do as an infra engineer. Banks have shitty IT infrastructure. It could be interesting and challenging depending on what you make of it.
Navi Mumbai is a better place to be in Maharashtra. You'll definitely miss Bangalore but it's a good opportunity I believe.