AK - UI What to do?

[Bankuri]

Another weakness in my game is how to play overcards. Villain here plays
poor hands to a showdown rather frequently. Will bet the flop a lot, but
very passive calling station after.

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Bankuri is UTG+2 with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Bankuri raises</font>, MP1 calls, <font color="#666666">4 folds</font>, SB calls, BB calls, UTG calls.

Flop: (10 SB) 5[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG checks, <font color="#CC3333">Bankuri bets</font>, MP1 calls, SB folds, BB folds, UTG folds.

I tend to bet with overpairs on most any flop. Mostly I don't want to 'show weakness', but
I realize frequently I'm ahead (in this case, likely no trips against me...most likely FD).
Betting out can mess up attempts to protect later, but likely not getting flush draws out
anyway on the turn so get your money in while you are ahead?

Turn: (6 BB) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Bankuri bets</font>, MP1 calls.

Do I bet out here UI? I'm playing against a weak player, but that only means I could be
way behind right now and not know it.

River: (8 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Bankuri ???

What to do here? This guy is still in the pot with me I really don't know what
he has. Pot is decent size and a bet likely won't take it down without a showdown.