Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001166928-18-000032-index-headers.html | 2018-04-26 08:28:07 | |
| 0001166928-18-000032-index.html | 2018-04-26 08:28:07 | |
| 0001166928-18-000032.txt | 2018-04-26 08:28:07 | |
 0001166928-18-000032-xbrl.zip | 246295 | 2018-04-26 08:28:07 |
| FilingSummary.xml | 35473 | 2018-04-26 08:28:07 |
| Financial_Report.xlsx | 85957 | 2018-04-26 08:28:07 |
| R1.htm | 22402 | 2018-04-26 08:28:07 |
| R10.htm | 23256 | 2018-04-26 08:28:07 |
| R11.htm | 218354 | 2018-04-26 08:28:07 |
| R12.htm | 653949 | 2018-04-26 08:28:07 |
| R13.htm | 61240 | 2018-04-26 08:28:07 |
| R14.htm | 36019 | 2018-04-26 08:28:07 |
| R15.htm | 50612 | 2018-04-26 08:28:07 |
| R16.htm | 17517 | 2018-04-26 08:28:07 |
| R17.htm | 165291 | 2018-04-26 08:28:07 |
| R18.htm | 70423 | 2018-04-26 08:28:07 |
| R19.htm | 22828 | 2018-04-26 08:28:07 |
| R2.htm | 90076 | 2018-04-26 08:28:07 |
| R20.htm | 218802 | 2018-04-26 08:28:07 |
| R21.htm | 645021 | 2018-04-26 08:28:07 |
| R22.htm | 58987 | 2018-04-26 08:28:07 |
| R23.htm | 34427 | 2018-04-26 08:28:07 |
| R24.htm | 50183 | 2018-04-26 08:28:07 |
| R25.htm | 12631 | 2018-04-26 08:28:07 |
| R26.htm | 157512 | 2018-04-26 08:28:07 |
| R27.htm | 8862 | 2018-04-26 08:28:07 |
| R28.htm | 4461 | 2018-04-26 08:28:07 |
| R29.htm | 21438 | 2018-04-26 08:28:07 |
| R3.htm | 24395 | 2018-04-26 08:28:07 |
| R30.htm | 31979 | 2018-04-26 08:28:07 |
| R31.htm | 15153 | 2018-04-26 08:28:07 |
| R32.htm | 36591 | 2018-04-26 08:28:07 |
| R33.htm | 8789 | 2018-04-26 08:28:07 |
| R34.htm | 49835 | 2018-04-26 08:28:07 |
| R35.htm | 18171 | 2018-04-26 08:28:07 |
| R36.htm | 11069 | 2018-04-26 08:28:07 |
| R37.htm | 22760 | 2018-04-26 08:28:07 |
| R38.htm | 11514 | 2018-04-26 08:28:07 |
| R39.htm | 47456 | 2018-04-26 08:28:07 |
| R4.htm | 91037 | 2018-04-26 08:28:07 |
| R40.htm | 41700 | 2018-04-26 08:28:07 |
| R41.htm | 58493 | 2018-04-26 08:28:07 |
| R42.htm | 53174 | 2018-04-26 08:28:07 |
| R43.htm | 36826 | 2018-04-26 08:28:07 |
| R44.htm | 28601 | 2018-04-26 08:28:07 |
| R45.htm | 26590 | 2018-04-26 08:28:07 |
| R46.htm | 6632 | 2018-04-26 08:28:07 |
| R47.htm | 44781 | 2018-04-26 08:28:07 |
| R48.htm | 12094 | 2018-04-26 08:28:07 |
| R49.htm | 40342 | 2018-04-26 08:28:07 |
| R5.htm | 39330 | 2018-04-26 08:28:07 |
| R50.htm | 5884 | 2018-04-26 08:28:07 |
| R51.htm | 30854 | 2018-04-26 08:28:07 |
| R52.htm | 8411 | 2018-04-26 08:28:07 |
| R53.htm | 9939 | 2018-04-26 08:28:07 |
| R54.htm | 66270 | 2018-04-26 08:28:07 |
| R55.htm | 7023 | 2018-04-26 08:28:07 |
| R56.htm | 68340 | 2018-04-26 08:28:07 |
| R57.htm | 5988 | 2018-04-26 08:28:07 |
| R6.htm | 31485 | 2018-04-26 08:28:07 |
| R7.htm | 4474 | 2018-04-26 08:28:07 |
| R8.htm | 89993 | 2018-04-26 08:28:07 |
| R9.htm | 22817 | 2018-04-26 08:28:07 |
| report.css | 2767 | 2018-04-26 08:28:07 |
| Show.js | 1410 | 2018-04-26 08:28:07 |
| wtba-20180331.xml | 3347784 | 2018-04-26 08:28:07 |
| wtba-20180331.xsd | 40941 | 2018-04-26 08:28:07 |
| wtba-20180331x10q.htm | 2341393 | 2018-04-26 08:28:07 |
| wtba-20180331xex311.htm | 13105 | 2018-04-26 08:28:07 |
| wtba-20180331xex312.htm | 13068 | 2018-04-26 08:28:07 |
| wtba-20180331xex321.htm | 3917 | 2018-04-26 08:28:07 |
| wtba-20180331xex322.htm | 4265 | 2018-04-26 08:28:07 |
| wtba-20180331_cal.xml | 126566 | 2018-04-26 08:28:07 |
| wtba-20180331_def.xml | 245449 | 2018-04-26 08:28:07 |
| wtba-20180331_lab.xml | 653107 | 2018-04-26 08:28:07 |
| wtba-20180331_pre.xml | 433405 | 2018-04-26 08:28:07 |