Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001166928-17-000093-index-headers.html | 2017-10-26 08:28:10 | |
| 0001166928-17-000093-index.html | 2017-10-26 08:28:10 | |
| 0001166928-17-000093.txt | 2017-10-26 08:28:10 | |
 0001166928-17-000093-xbrl.zip | 267555 | 2017-10-26 08:28:10 |
| FilingSummary.xml | 35185 | 2017-10-26 08:28:10 |
| Financial_Report.xlsx | 90165 | 2017-10-26 08:28:10 |
| R1.htm | 22402 | 2017-10-26 08:28:10 |
| R10.htm | 39800 | 2017-10-26 08:28:10 |
| R11.htm | 259839 | 2017-10-26 08:28:10 |
| R12.htm | 817220 | 2017-10-26 08:28:10 |
| R13.htm | 6314 | 2017-10-26 08:28:10 |
| R14.htm | 64152 | 2017-10-26 08:28:10 |
| R15.htm | 35310 | 2017-10-26 08:28:10 |
| R16.htm | 45737 | 2017-10-26 08:28:10 |
| R17.htm | 17539 | 2017-10-26 08:28:10 |
| R18.htm | 188996 | 2017-10-26 08:28:10 |
| R19.htm | 77678 | 2017-10-26 08:28:10 |
| R2.htm | 92738 | 2017-10-26 08:28:10 |
| R20.htm | 39372 | 2017-10-26 08:28:10 |
| R21.htm | 260499 | 2017-10-26 08:28:10 |
| R22.htm | 808126 | 2017-10-26 08:28:10 |
| R23.htm | 62804 | 2017-10-26 08:28:10 |
| R24.htm | 34437 | 2017-10-26 08:28:10 |
| R25.htm | 45308 | 2017-10-26 08:28:10 |
| R26.htm | 12639 | 2017-10-26 08:28:10 |
| R27.htm | 174150 | 2017-10-26 08:28:10 |
| R28.htm | 22254 | 2017-10-26 08:28:10 |
| R29.htm | 35307 | 2017-10-26 08:28:10 |
| R3.htm | 24400 | 2017-10-26 08:28:10 |
| R30.htm | 15157 | 2017-10-26 08:28:10 |
| R31.htm | 63761 | 2017-10-26 08:28:10 |
| R32.htm | 9263 | 2017-10-26 08:28:10 |
| R33.htm | 54820 | 2017-10-26 08:28:10 |
| R34.htm | 18499 | 2017-10-26 08:28:10 |
| R35.htm | 4855 | 2017-10-26 08:28:10 |
| R36.htm | 22772 | 2017-10-26 08:28:10 |
| R37.htm | 12159 | 2017-10-26 08:28:10 |
| R38.htm | 47463 | 2017-10-26 08:28:10 |
| R39.htm | 46215 | 2017-10-26 08:28:10 |
| R4.htm | 96737 | 2017-10-26 08:28:10 |
| R40.htm | 58869 | 2017-10-26 08:28:10 |
| R41.htm | 53228 | 2017-10-26 08:28:10 |
| R42.htm | 40916 | 2017-10-26 08:28:10 |
| R43.htm | 28617 | 2017-10-26 08:28:10 |
| R44.htm | 26601 | 2017-10-26 08:28:10 |
| R45.htm | 6632 | 2017-10-26 08:28:10 |
| R46.htm | 14706 | 2017-10-26 08:28:10 |
| R47.htm | 36444 | 2017-10-26 08:28:10 |
| R48.htm | 16163 | 2017-10-26 08:28:10 |
| R49.htm | 40344 | 2017-10-26 08:28:10 |
| R5.htm | 37037 | 2017-10-26 08:28:10 |
| R50.htm | 5884 | 2017-10-26 08:28:10 |
| R51.htm | 26801 | 2017-10-26 08:28:10 |
| R52.htm | 8411 | 2017-10-26 08:28:10 |
| R53.htm | 9941 | 2017-10-26 08:28:10 |
| R54.htm | 73628 | 2017-10-26 08:28:10 |
| R55.htm | 7023 | 2017-10-26 08:28:10 |
| R56.htm | 71826 | 2017-10-26 08:28:10 |
| R57.htm | 8157 | 2017-10-26 08:28:10 |
| R6.htm | 36365 | 2017-10-26 08:28:10 |
| R7.htm | 4783 | 2017-10-26 08:28:10 |
| R8.htm | 90468 | 2017-10-26 08:28:10 |
| R9.htm | 23802 | 2017-10-26 08:28:10 |
| report.css | 2767 | 2017-10-26 08:28:10 |
| Show.js | 1410 | 2017-10-26 08:28:10 |
| wtba-20170930.xml | 4014723 | 2017-10-26 08:28:10 |
| wtba-20170930.xsd | 38786 | 2017-10-26 08:28:10 |
| wtba-20170930x10q.htm | 3053703 | 2017-10-26 08:28:10 |
| wtba-20170930xex311.htm | 13107 | 2017-10-26 08:28:10 |
| wtba-20170930xex312.htm | 13070 | 2017-10-26 08:28:10 |
| wtba-20170930xex321.htm | 3923 | 2017-10-26 08:28:10 |
| wtba-20170930xex322.htm | 4271 | 2017-10-26 08:28:10 |
| wtba-20170930_cal.xml | 126881 | 2017-10-26 08:28:10 |
| wtba-20170930_def.xml | 246412 | 2017-10-26 08:28:10 |
| wtba-20170930_lab.xml | 678037 | 2017-10-26 08:28:10 |
| wtba-20170930_pre.xml | 442543 | 2017-10-26 08:28:10 |