{"cik":"0001268291","entityType":"operating","sic":"6189","sicDescription":"Asset-Backed Securities","ownerOrg":null,"insiderTransactionForOwnerExists":0,"insiderTransactionForIssuerExists":0,"name":"WAMU MORTGAGE PASS-THROUGH CERTIFICATES SER 2003-S12","tickers":[],"exchanges":[],"ein":"000000000","lei":null,"description":"","website":"","investorWebsite":"","category":"","fiscalYearEnd":"1231","stateOfIncorporation":"DE","stateOfIncorporationDescription":"DE","addresses":{"mailing":{"street1":null,"street2":null,"city":null,"stateOrCountry":null,"zipCode":null,"stateOrCountryDescription":null,"isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":"1201 THIRD AVENUE","street2":"WMT1706","city":"SEATLE","stateOrCountry":"WA","zipCode":"98101","stateOrCountryDescription":"WA","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null}},"phone":"2063778555","flags":"","formerNames":[],"filings":{"recent":{"accessionNumber":["0001277277-05-000406","0001285923-05-000058","0001285923-04-001503","0001285923-04-001340","0001285923-04-001207","0001285923-04-001077","0001285923-04-000949","0001285923-04-000820","0001285923-04-000710","0001285923-04-000461","0001285923-04-000262","0001279818-04-000218","0001277277-04-000307","0001274440-04-000218","0001216057-04-000436","0001216057-04-000216","0001216057-03-000275","0000950117-03-004778","0000950117-03-004547"],"filingDate":["2005-03-30","2005-01-27","2004-12-29","2004-11-30","2004-10-27","2004-09-29","2004-08-27","2004-07-30","2004-07-02","2004-06-04","2004-05-04","2004-04-05","2004-03-26","2004-03-03","2004-02-04","2004-01-07","2003-12-04","2003-11-10","2003-10-27"],"reportDate":["2004-12-31","","2004-12-27","2004-11-26","2004-10-25","2004-09-27","2004-08-27","2004-07-30","2004-07-01","2004-06-01","2004-05-01","2004-04-01","2003-12-31","2004-03-01","2004-02-01","2004-01-01","2003-12-01","2003-10-28",""],"acceptanceDateTime":["2005-03-30T01:43:20.000Z","2005-01-27T17:37:16.000Z","2004-12-29T21:00:45.000Z","2004-11-30T15:18:00.000Z","2004-10-27T14:25:11.000Z","2004-09-29T14:34:46.000Z","2004-08-27T16:45:58.000Z","2004-07-30T15:05:13.000Z","2004-07-02T14:23:28.000Z","2004-06-04T14:38:09.000Z","2004-05-04T19:15:47.000Z","2004-04-05T16:14:49.000Z","2004-03-26T02:36:57.000Z","2004-03-03T16:28:25.000Z","2004-02-04T15:39:53.000Z","2004-01-07T15:14:22.000Z","2003-12-04T18:41:27.000Z","2003-11-10T22:16:07.000Z","2003-10-27T21:32:22.000Z"],"act":["34","34","34","34","34","","","","","","","","","","","","","",""],"form":["10-K","15-15D","8-K","8-K","8-K","8-K","8-K","8-K","8-K","8-K","8-K","8-K","10-K","8-K","8-K","8-K","8-K","8-K","424B5"],"fileNumber":["333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25","333-103345-25"],"filmNumber":["05711251","05552835","041231235","041173398","041098325","041051472","041001544","04941050","04897526","04848767","04777391","04716276","04691155","04645008","04565192","04511968","031037260","03989454","03958800"],"items":["","","8.01,9.01","8.01,9.01","8.01,9.01","8.01,9.01","8.01,9.01","5,7","5,7","5,7","5,7","5,7","","5,7","5,7","5,7","5,7","7",""],"core_type":["10-K","15-15D","8-K","8-K","8-K","8-K","8-K","8-K","8-K","8-K","8-K","8-K","10-K","8-K","8-K","8-K","8-K","8-K","424B5"],"size":[14249,7241,223288,223272,223261,223242,223233,206145,206159,206161,205905,205874,13501,205872,205867,205826,205888,629380,804338],"isXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isInlineXBRL":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"isXBRLNumeric":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"primaryDocument":["form10k081.txt","form15d_081.htm","signwamu2003_s12.htm","signwamu2003_s12.htm","signwamu2003_s12.htm","signwamu2003_s12.htm","signwamu2003_s12.htm","signwamu2003_s12.txt","signwamu2003_s12.txt","signwamu2003_s12.txt","signwamu2003_s12.htm","signwamu2003_s12.htm","form10k081.txt","signwamu2003_s12.htm","signwamu2003_s12.htm","signwamu2003_s12.htm","signwamu2003_s12.htm","a36452.txt","a36325.txt"],"primaryDocDescription":["","","LETTER","LETTER","LETTER","LETTER","LETTER","LETTER","LETTER","LETTER","LETTER","LETTER","","LETTER","LETTER","LETTER","LETTER","WASHINGTON MUTUAL SERIES-2003-S12","WASHINGTON MUTUAL SERIES 2003-S12"]},"files":[]}}