Banks here would rather do a check than involve themselves in the extra step of reporting cash transactions above the drug dealer limit. Expect it would be like that pretty much everywhere.
ANY transaction over $10,000 - regardless of cash, check, ACH, etc. - is a reportable transaction.
What’s more, any transactions that are split apart to avoid the $10,000 reporting limit not only get reported, but also open up the person engaging in those transactions to legal liability.
In short, if you’re reporting the sort of income that would make it unlikely that you can engage in transactions over $10k, you need to have a documented way of establishing where you got the money. If you engage in a series of transactions over $10k, or even close to that, they’ll definitely be looking at you.
Businessmen who underreport their income, Congressmen paying blackmail money, people with undeclared foreign assets - these are all the sorts of people that can run afoul of this.

