50 NL- I have an overpair, vs a loose villian

[homeslice]

Villain has been loose passive, so I figure he's got something decent or something that can be dominated(ATo+, JJ+), with how the PF play went. I was hoping to take down on the flop, but he called. So he may a set, so that's why I check behind on the turn. But the board pairs, so I don't know if I'm up a smaller two pair, or a full house. His shove confuses me, 'cuz I don't know if he wants me to call. Can I call his river push?

PokerStars No-Limit Hold'em, $0.50 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

SB ($22.15)
BB ($185.80)
UTG ($56.85)
Hero ($50)
Button ($133.35)

Preflop: Hero is MP with , .
[color=#CC3333]UTG raises to $2</font>, [color=#CC3333]Hero raises to $8</font>, [color=#666666]3 folds</font>, UTG calls $6.

Flop: ($16.75) , , [color=#0000FF](2 players)</font>
UTG checks, [color=#CC3333]Hero bets $12</font>, UTG calls $12.

Turn: ($40.75) [color=#0000FF](2 players)</font>
UTG checks, Hero checks.

River: ($40.75) [color=#0000FF](2 players)</font>
[color=#CC3333]UTG bets $36.85 (All-In)</font>, Hero ???