How to calculate the maximum amplification of a transimpedance amplifier
Since the internal compensation for guaranteed stability with any RF value is at 30Hz, the GBW is 100MHz from 100Hz and up. Therefore indeed 40dB gain at 100kHz and the gain in mV/mA is =Rf.    

You can see the DC gain is less than 120dB and the integrator starts at 30 Hz.