B190 FLT CREW DID NOT STOP AT ATC ASSIGNED ALT; BOTH PLT'S FAILING TO ADHERE TO COCKPIT PROCS AND FLT VIGILANCE.

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AS THE CAPT; I WAS THE PF DURING THIS FLT. WE HAD BEEN FILED FOR FL210. AFTER DEPARTING THE ARPT; WE HAD BEEN GIVEN CLRNCS DURING THE CLB FOR CLBING AT ABOUT 2000 FT EACH TIME. OUR LAST INSTRUCTIONS (RECEIVED AT 17000 FT) WERE TO CLB TO FL190. WHILE PASSING THROUGH FL180; WE BOTH RESET OUR ALTIMETERS TO 29.92 AND VERBALLY NOTED HAVING DONE SO. HOWEVER; I DON'T RECALL US HAVING NOTED 1000 FT TO LEVELOFF. BOTH MYSELF AND THE FO WERE CHKING ON THE ROUTING AND DIDN'T OBSERVE HAVING CLBED THROUGH FL190. HOWEVER; WE BOTH RECOGNIZED THE FACT THAT WE HAD GONE ABOUT 500 FT HIGH. WE WERE JUST ABOUT TO CALL CTR AND LET THEM KNOW WHEN WE WERE GIVEN A CLB TO FL210. WE QUICKLY CLBED THE ACFT TO FL210 AND LEVELED OFF WITH NO FURTHER INCIDENTS. THIS SITUATION WAS CAUSED BY MY NOT HAVING BEEN 100% FOCUSED ON FLYING THE ACFT AND ALSO THE FO NOT MONITORING THE ALT. WE DIDN'T MAKE OUR 1000 FT TO LEVELOFF CALL (AS FAR AS I CAN REMEMBER). WE BOTH SHOULD HAVE BEEN MONITORING THE CLB MORE CLOSELY. I THINK THAT I SHOULD NOT HAVE BEEN LOOKING AT THE CHART EITHER UNTIL IN LEVEL FLT; NOT DURING A CLB PHASE.