How do you like this push?

InterPoker Hold'em NL ($0.15/$0.25)
The table is very loose (41% vpip) but I haven't caught a big hand yet. My main opponent hasn't been sitting for and I haven't seen anything extraordinary about him other than being somewhat loose.

Table "Hermine" Seat 1 is the button.
Seat 1: BUTTON ($8.35 in chips)
Seat 2: SB ($33.85 in chips)
Seat 3: BB ($23.10 in chips)
Seat 4: KING ($16.70 in chips)
Seat 5: UTG+1 ($30.65 in chips)
Seat 6: MP1 ($4.50 in chips)
Seat 7: MP2 ($17.85 in chips)
Seat 8: MP3 ($15.60 in chips)
Seat 9: LP sits out
Seat 10: CO ($15.95 in chips)
SB : posts small blind $0.15
BB: posts big blind $0.25
----- HOLE CARDS -----
dealt to KING [A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img]]
KING: raises to $1
UTG+1: folds
MP1: folds
MP2: folds
MP3: calls $1
CO: calls $1
BUTTON: folds
SB : folds
BB: calls $0.75
----- FLOP ----- [8[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img]]
BB: checks
KING: bets $3
MP3: folds
CO: calls $3
BB: calls $3
----- TURN ----- [8[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img]][J[img]/images/graemlins/club.gif[/img]]
BB: checks
KING: bets $12.70 and is all-in