5edaebfc_ere_a_Difference____Boston_Fed__Overdraft_Protection
[Comparison Chart] Does the Bank Consistently Pay My Overdraft Items? Approval of overdraft items is at the discretion of the bank which is not obligated to pay an overdraft [Overdraft Protection] 
Bank will always use this feature as long as there are funds available in one of the accounts
Bounce Protection and Overdraft Protection: Is There a Difference? - Boston Fed
Overdraft Protection