TIA Design for Detector (100MHz Bandwidth)

I am currently designing a TIA circuit for a soft X-ray detector, and my requirements are as follows:

1. The signal current is approximately 80–300 pA, detector capacitance is about 100 pF (with 24 V bias), and the dark current is around 15 nA.

2. I need a bandwidth of about –3 dB at 100 MHz (based on other similar design using the ADA4851 op amp).

3. I would like the maximum output voltage to fall within 1 V to 1.5 V.

At the moment, I am considering using either the OPA657 or LMH6629 (but I’m also open to other recommendations). My questions are:

1. How should I design the first-stage TIA circuit? Given the influence of dark current, should I use AC coupling between the detector and the TIA?

2. Considering my bandwidth requirement, do I need to use a smaller feedback resistance in the TIA and then add subsequent amplification stages to gradually achieve the desired output level? If so, what would be an appropriate value for the feedback resistance?