AC 10-25 River Surprise

[frogger23]

Just got back from my first ever Atlantic City trip. Wondering what you all thought of this hand. The villain in question was sitting with just over 7k and I covered. He had been calling raises fairly frequently with position over the course of the previous 2 hours but this is the first time I saw him show major aggression postflop. I had seen him call big turn and river bets twice, both times losing to another player who flopped a set (once he showed top two pair on a non flush/straight board). He seems to be a decent, somewhat too loose, passive player. On to the hand...

I raise after one EP limper to $125 with A [img]/images/graemlins/club.gif[/img]10 [img]/images/graemlins/club.gif[/img]. Cutoff and villian(button) call, as does BB and EP limper. Flop comes Q [img]/images/graemlins/club.gif[/img]10 [img]/images/graemlins/spade.gif[/img]10 [img]/images/graemlins/diamond.gif[/img]. The 5 of us see the flop. I lead for $400 (I think villain would have viewed me as a tight player, a tad on the aggressive side). Villain calls and everyone else folds. Turn brings the 2 [img]/images/graemlins/heart.gif[/img], completing the rainbow. I bet $800 and villain calls. River is the 4 [img]/images/graemlins/diamond.gif[/img]. I bet $2000 and villain thinks for a second and pushes for 3k more. Now the pot has over 10k and it is 3k for me to call.

I was not too familiar with villain, but I can't imagine he would make this move as a bluff practically ever. Are there enough hands that a tight conservative player will push for value here that I beat (weaker 10s I suppose) that can justify this call? Any other thoughts about my line are appreciated.