بسم الله الرحمن الرحيم
Yes, it is haram. As interest based dealing is haram in the same way it is also haram to help bank and people and to arrange bank loan for them. The holy Quran says:
وَلاَ تَعَاوَنُواْ عَلَى الإِثْمِ وَالْعُدْوَانِ [المائدة : 2[
Allah knows Best!
Darul Uloom Deoband