Some banks have quantified factors such as length of account relationship, deposit balances, similar borrowing experiences, etc.
IMHO, make sure they're quantified. A deposit relationship is different for one with an overdraft to one in the 6 figure range. Same for borrowing. An unused $5,000 credit card is a borrowing relationship, so is a $250K loan paid as agreed.
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Integrity. With it, nothing else matters. Without it, nothing else matters.