Cisco Shaping Algorithm Question

So my shaping paramters are:

CIR: 1,000,000 bit/sec

Bc:   125,000 bits

Be:   3,000,000 bits

Tc:   125ms

So every 125ms the shaper runs and sends 125,000 bits of data.  This happens 8 times per second for a rate of 1,000,000 bits/sec.  

Now, if the router is idle, since i have a very large Be, I can build up credit.  So if i'm idle for 2 seconds, does that mean that i can build up 2,000,000 bits worth of credit and then send it out all at once?  If so, wouldn't I exceed my CIR of 1,000,000 bits per second?  Or does it only allow you to build up credit upto 1 second worth not to exceed the CIR?

Thanks.