CARJ LNDG ALB DSNDED BELOW ASSIGNED ALT AND CROSSED LOC WHILE EXECUTING ILS RWY 19 APCH.

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WE WERE ON A FLT TO ALB IN SCATTERED CLOUDS AND TSTMS. ON APCH; THE WX AT ALB WAS RPTED AS SCATTERED AT 3000 FT AND 10 SM OF VISIBILITY. WE WERE CLRED TO DSND FROM 5000 FT TO 2000 FT. I INITIATED THE DSCNT WHEN WE WERE GIVEN A VECTOR TO INTERCEPT THE LOC AND CLRED FOR THE APCH. AS THE AUTOPLT BEGAN THE TURN; I ARMED THE APCH FUNCTION OF THE AUTOPLT. OUR FINAL TURN ALLOWED A 40 KT TAILWIND TO BLOW US THROUGH THE LOC. THE AUTOPLT CAPTURED BOTH THE LOC AND GS. AT FULL DEFLECTION THE AUTOPLT THEN RELEASED THE LOC; BUT REMAINED CAPTURED TO THE GS. WE THEN DSNDED BELOW THE 2000 FT ALT ASSIGNED. I SELECTED THE ALT CAPTURE FUNCTION AT 2000 FT; BUT THE AIRPLANE FINALLY LEVELED AT APPROX 1700 FT. WE HAD THE ARPT IN SIGHT AT THAT TIME AND MADE A SAFE VISUAL APCH AND LNDG. THERE WAS NO CONFLICT WITH OTHER TFC OR TERRAIN. SUPPLEMENTAL INFO FROM ACN 620601: WE WERE IN VMC WITH THE RWY IN SIGHT AND AN APCH CLRNC; SO I DIDN'T CORRECT THE CAPT ON THE ALT ASSIGNMENT. THE CTLR QUERIED US ABOUT OUR ALT BEING LOWER THAN ASSIGNED. I RESPONDED THAT WE WERE VMC. MY RATIONALE IS THAT WE COULD DSND AT OUR DISCRETION WHEN IN A NORMAL DSCNT PROFILE AND RWY IN SIGHT EVEN THOUGH THE LOC WAS STILL FULL SCALE. I DO NOT KNOW IF THIS IS CORRECT OR NOT. THE CTLR SEEMED SOMEWHAT ANNOYED; BUT DID NOT ASK FOR A PHONE CALL.