Definition of Extent of such payment
Under statute extending right of subrogation to Federal Deposit Insurance Corporation, phrase “to the extent of such payment” is equivalent to term “pro tanto” or words “as to the portion of the deposit paid”. Federal Deposit Ins. Corporation v. Citizens State Bank of Niangua, C.C.A.Mo., 130 F.2d 102, 103.
That's the definition of Extent of such payment in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.