Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001166928-21-000109-index-headers.html | 2021-10-28 07:22:08 | |
| 0001166928-21-000109-index.html | 2021-10-28 07:22:08 | |
| 0001166928-21-000109.txt | 2021-10-28 07:22:08 | |
 0001166928-21-000109-xbrl.zip | 340569 | 2021-10-28 07:22:08 |
| FilingSummary.xml | 31929 | 2021-10-28 07:22:08 |
| Financial_Report.xlsx | 96517 | 2021-10-28 07:22:08 |
| MetaLinks.json | 624108 | 2021-10-28 07:22:08 |
| R1.htm | 52161 | 2021-10-28 07:22:08 |
| R10.htm | 524535 | 2021-10-28 07:22:08 |
| R11.htm | 34441 | 2021-10-28 07:22:08 |
| R12.htm | 32037 | 2021-10-28 07:22:08 |
| R13.htm | 30221 | 2021-10-28 07:22:08 |
| R14.htm | 14650 | 2021-10-28 07:22:08 |
| R15.htm | 163498 | 2021-10-28 07:22:08 |
| R16.htm | 59341 | 2021-10-28 07:22:08 |
| R17.htm | 27538 | 2021-10-28 07:22:08 |
| R18.htm | 119517 | 2021-10-28 07:22:08 |
| R19.htm | 518619 | 2021-10-28 07:22:08 |
| R2.htm | 121443 | 2021-10-28 07:22:08 |
| R20.htm | 31468 | 2021-10-28 07:22:08 |
| R21.htm | 29422 | 2021-10-28 07:22:08 |
| R22.htm | 29674 | 2021-10-28 07:22:08 |
| R23.htm | 10188 | 2021-10-28 07:22:08 |
| R24.htm | 151822 | 2021-10-28 07:22:08 |
| R25.htm | 37872 | 2021-10-28 07:22:08 |
| R26.htm | 28995 | 2021-10-28 07:22:08 |
| R27.htm | 30416 | 2021-10-28 07:22:08 |
| R28.htm | 9633 | 2021-10-28 07:22:08 |
| R29.htm | 45912 | 2021-10-28 07:22:08 |
| R3.htm | 119730 | 2021-10-28 07:22:08 |
| R30.htm | 4857 | 2021-10-28 07:22:08 |
| R31.htm | 22757 | 2021-10-28 07:22:08 |
| R32.htm | 18702 | 2021-10-28 07:22:08 |
| R33.htm | 47447 | 2021-10-28 07:22:08 |
| R34.htm | 46198 | 2021-10-28 07:22:08 |
| R35.htm | 69011 | 2021-10-28 07:22:08 |
| R36.htm | 53163 | 2021-10-28 07:22:08 |
| R37.htm | 45647 | 2021-10-28 07:22:08 |
| R38.htm | 28294 | 2021-10-28 07:22:08 |
| R39.htm | 26595 | 2021-10-28 07:22:08 |
| R4.htm | 48963 | 2021-10-28 07:22:08 |
| R40.htm | 10029 | 2021-10-28 07:22:08 |
| R41.htm | 56656 | 2021-10-28 07:22:08 |
| R42.htm | 20224 | 2021-10-28 07:22:08 |
| R43.htm | 41859 | 2021-10-28 07:22:08 |
| R44.htm | 33320 | 2021-10-28 07:22:08 |
| R45.htm | 8417 | 2021-10-28 07:22:08 |
| R46.htm | 4225 | 2021-10-28 07:22:08 |
| R47.htm | 8085 | 2021-10-28 07:22:08 |
| R48.htm | 58034 | 2021-10-28 07:22:08 |
| R49.htm | 7036 | 2021-10-28 07:22:08 |
| R5.htm | 58505 | 2021-10-28 07:22:08 |
| R50.htm | 67168 | 2021-10-28 07:22:08 |
| R51.htm | 4086 | 2021-10-28 07:22:08 |
| R6.htm | 101374 | 2021-10-28 07:22:08 |
| R7.htm | 17072 | 2021-10-28 07:22:08 |
| R8.htm | 28964 | 2021-10-28 07:22:08 |
| R9.htm | 115729 | 2021-10-28 07:22:08 |
| report.css | 2767 | 2021-10-28 07:22:08 |
| Show.js | 1085 | 2021-10-28 07:22:08 |
| wtba-20210930.htm | 3408992 | 2021-10-28 07:22:08 |
| wtba-20210930.xsd | 35354 | 2021-10-28 07:22:08 |
| wtba-20210930xex311.htm | 10177 | 2021-10-28 07:22:08 |
| wtba-20210930xex312.htm | 10167 | 2021-10-28 07:22:08 |
| wtba-20210930xex321.htm | 3280 | 2021-10-28 07:22:08 |
| wtba-20210930xex322.htm | 3340 | 2021-10-28 07:22:08 |
| wtba-20210930_cal.xml | 107956 | 2021-10-28 07:22:08 |
| wtba-20210930_def.xml | 246906 | 2021-10-28 07:22:08 |
| wtba-20210930_htm.xml | 3143496 | 2021-10-28 07:22:08 |
| wtba-20210930_lab.xml | 573504 | 2021-10-28 07:22:08 |
| wtba-20210930_pre.xml | 417404 | 2021-10-28 07:22:08 |