You can lending an unlimited amount if the loan is CD secured and held at your bank.
215.5(c)(3) In any amount, if the extension of credit is secured in a manner described in Sec. 215.4(d)(3)(i)(A) through (d)(3)(i)(C) of this part;
215.4(d)(3)(i)(C) Extensions of credit secured by a perfected security interest in a segregated deposit account in the lending bank;
All other requirements under 215.5(d) will still apply.