Ohio Rev. Code Ann. § 3901.63
(B)
(2) For the purposes of division (B)(1) of this section, a "United States financial institution" is qualified if both of the following apply:
(C) The funds held directly by the ceding insurer or in trust on behalf of the ceding insurer shall be in any of the following forms:
(3) Irrevocable, unconditional, and automatically renewable letters of credit that are issued or confirmed by a qualified United States financial institution. For purposes of division (C)(3) of this section, a United States financial institution is qualified if all of the following apply: