If theres anyone who pays their debts in both blood and coin better than the Lannisters, its the Iron Bank. Their unofficial motto is probably something like, In the game of debt, you pay or you die, because in the books they have literally hired entire mercenary armies to reclaim unpaid debts. Westeros, as has been hinted at this season, is very quickly becoming one of those clients. Having Stannis and his trusty Onion Knight actually travel all the way to their compound in Braavos to request a loan was absolutely brilliant. It finally expanded the world we know to the free city Braavos, it lent a new gravitas to the plight of Seven Kingdoms financial woes, and gave a chance for Davos to flex his diplomatic muscles and prove his worth to Stannis something which hasnt occurred in quite some time all in one fell swoop. Bravo Weiss and Benioff, bravo (get it?).