Ken,
The OPA377 common-mode and differential input capacitance is given in PDS to be 13pF and 6.5pF, respectively, while the common-mode and differential input resistances like in most CMOS op amps are extremely high - around 
.
If the IB vs Vcm graph is given in PDS (see graph below), then Rin may also be easily calculated: Rin = delta_Vcm/delta_IB = 5V/0.4pA ~ 1.25E+13.
By the way, I answered the same question few month ago (see link below) - in the future please use the search engine for answers before placing a new post.
https://e2e.ti.com/support/amplifiers/precision_amplifiers/int-precision_amplifiers/f/16/t/146488.aspx#529383
