Whenever you state GAAP?
Brody Preston — Stephens Inc — Analyst
Yes, after all you provide — yes you provide an FTE and a GAAP margin in your pr release. And thus imagine down that the core margin on a GAAP plus an FTE foundation simply.
Robert Michael Gorman — Executive Vice President and Chief Financial Officer
Yes, that is FTE foundation that people’re speaking about here.
Brody Preston — Stephens Inc — Analyst
Okay. Therefore it appears like perhaps simply just a little extra compression in the 1st quarter and then type of stable to up after that?
Robert Michael Gorman — Executive Vice President and Chief Financial Officer
Yes. That is perfect.
Brody Preston — Stephens Inc — Analyst
Okay. Fine. I recently wished to touch on which per cent of loans, the mortgage profile is linked with LIBOR and exactly how most of this is certainly one thirty days LIBOR?
Robert Michael Gorman — Executive Vice President and Chief Financial Officer
Yes the book that is total 24% is tied to 30 days LIBOR. Therefore it is pretty sensitive to that LIBOR price. And you may already know, it declined a lot in the 4th quarter, about 30 foundation points. I believe making sure that had been a driver that is big of loan yield compression you saw — we saw.
Brody Preston — Stephens Inc — Analyst
Ok and exactly what % regarding the profile is associated with prime?
Robert Michael Gorman — Executive Vice President and Chief Financial Officer
Brody Preston — Stephens Inc — Analyst
Okay. And I also’m presuming these loans type of reprice through the quarter for a monthly foundation?
Robert Michael Gorman — Executive Vice President and Chief Financial Officer