Overbet push with nuts: how often is this called?

[Pokey]

<font color="blue">Hero is fairly new to the table and has no reads. Hero also hasn't done anything remarkable at the table yet.</font>

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
UTG: $147.15
UTG+1: $68.20
CO: $124.60
Button: $37.50
SB: $96.20
Hero: $118.15

Pre-flop: (6 players) Hero is BB with 6[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/diamond.gif[/img]
UTG calls, UTG+1 folds, CO calls, Button folds, SB calls, Hero checks.

Flop: 8[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] ($4, 4 players)
SB checks, <font color="#cc0000">Hero bets $4</font>, UTG folds, CO calls, SB folds.

Turn: 4[img]/images/graemlins/club.gif[/img] ($12, 2 players)
<font color="#cc0000">Hero bets $12</font>, CO calls.

River: 2[img]/images/graemlins/heart.gif[/img] ($36, 2 players)
<font color="#cc0000">Hero bets $111.15 (all-in)</font>....