Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000784977-22-000009-index-headers.html | 2022-02-16 19:39:50 | |
| 0000784977-22-000009-index.html | 2022-02-16 19:39:50 | |
| 0000784977-22-000009.txt | 2022-02-16 19:39:50 | |
 0000784977-22-000009-xbrl.zip | 602803 | 2022-02-16 19:39:50 |
| a202110-kex1015.htm | 89856 | 2022-02-16 19:39:50 |
| a202110-kex1016.htm | 86889 | 2022-02-16 19:39:50 |
| a202110-kex231.htm | 2625 | 2022-02-16 19:39:50 |
| a202110-kex311.htm | 10334 | 2022-02-16 19:39:50 |
| a202110-kex312.htm | 10309 | 2022-02-16 19:39:50 |
| a202110-kex321.htm | 6112 | 2022-02-16 19:39:50 |
| FilingSummary.xml | 65880 | 2022-02-16 19:39:50 |
| Financial_Report.xlsx | 189767 | 2022-02-16 19:39:50 |
| MetaLinks.json | 1128504 | 2022-02-16 19:39:50 |
| por-20211231.htm | 3751836 | 2022-02-16 19:39:50 |
| por-20211231.xsd | 98776 | 2022-02-16 19:39:50 |
| por-20211231_cal.xml | 131415 | 2022-02-16 19:39:50 |
| por-20211231_def.xml | 491084 | 2022-02-16 19:39:50 |
| por-20211231_htm.xml | 3503285 | 2022-02-16 19:39:50 |
| por-20211231_lab.xml | 1145030 | 2022-02-16 19:39:50 |
| por-20211231_pre.xml | 757473 | 2022-02-16 19:39:50 |
| R1.htm | 66807 | 2022-02-16 19:39:50 |
| R10.htm | 36127 | 2022-02-16 19:39:50 |
| R100.htm | 17990 | 2022-02-16 19:39:50 |
| R101.htm | 11590 | 2022-02-16 19:39:50 |
| R102.htm | 40614 | 2022-02-16 19:39:50 |
| R103.htm | 24688 | 2022-02-16 19:39:50 |
| R104.htm | 19205 | 2022-02-16 19:39:50 |
| R105.htm | 17546 | 2022-02-16 19:39:50 |
| R106.htm | 28367 | 2022-02-16 19:39:50 |
| R107.htm | 4143 | 2022-02-16 19:39:50 |
| R11.htm | 171955 | 2022-02-16 19:39:50 |
| R12.htm | 75520 | 2022-02-16 19:39:50 |
| R13.htm | 67077 | 2022-02-16 19:39:50 |
| R14.htm | 35650 | 2022-02-16 19:39:50 |
| R15.htm | 20200 | 2022-02-16 19:39:50 |
| R16.htm | 25511 | 2022-02-16 19:39:50 |
| R17.htm | 353667 | 2022-02-16 19:39:50 |
| R18.htm | 59117 | 2022-02-16 19:39:50 |
| R19.htm | 6132 | 2022-02-16 19:39:50 |
| R2.htm | 87047 | 2022-02-16 19:39:50 |
| R20.htm | 36853 | 2022-02-16 19:39:50 |
| R21.htm | 14258 | 2022-02-16 19:39:50 |
| R22.htm | 57456 | 2022-02-16 19:39:50 |
| R23.htm | 84990 | 2022-02-16 19:39:50 |
| R24.htm | 18408 | 2022-02-16 19:39:50 |
| R25.htm | 50941 | 2022-02-16 19:39:50 |
| R26.htm | 7531 | 2022-02-16 19:39:50 |
| R27.htm | 5751 | 2022-02-16 19:39:50 |
| R28.htm | 90242 | 2022-02-16 19:39:50 |
| R29.htm | 12613 | 2022-02-16 19:39:50 |
| R3.htm | 23912 | 2022-02-16 19:39:50 |
| R30.htm | 21166 | 2022-02-16 19:39:50 |
| R31.htm | 5093 | 2022-02-16 19:39:50 |
| R32.htm | 6552 | 2022-02-16 19:39:50 |
| R33.htm | 18548 | 2022-02-16 19:39:50 |
| R34.htm | 5185 | 2022-02-16 19:39:50 |
| R35.htm | 5605 | 2022-02-16 19:39:50 |
| R36.htm | 10658 | 2022-02-16 19:39:50 |
| R37.htm | 7436 | 2022-02-16 19:39:50 |
| R38.htm | 26524 | 2022-02-16 19:39:50 |
| R39.htm | 50195 | 2022-02-16 19:39:50 |
| R4.htm | 154501 | 2022-02-16 19:39:50 |
| R40.htm | 240898 | 2022-02-16 19:39:50 |
| R41.htm | 75699 | 2022-02-16 19:39:50 |
| R42.htm | 107468 | 2022-02-16 19:39:50 |
| R43.htm | 30742 | 2022-02-16 19:39:50 |
| R44.htm | 15106 | 2022-02-16 19:39:50 |
| R45.htm | 26458 | 2022-02-16 19:39:50 |
| R46.htm | 420753 | 2022-02-16 19:39:50 |
| R47.htm | 59155 | 2022-02-16 19:39:50 |
| R48.htm | 33474 | 2022-02-16 19:39:50 |
| R49.htm | 12619 | 2022-02-16 19:39:50 |
| R5.htm | 63331 | 2022-02-16 19:39:50 |
| R50.htm | 55457 | 2022-02-16 19:39:50 |
| R51.htm | 49923 | 2022-02-16 19:39:50 |
| R52.htm | 18740 | 2022-02-16 19:39:50 |
| R53.htm | 19047 | 2022-02-16 19:39:50 |
| R54.htm | 11125 | 2022-02-16 19:39:50 |
| R55.htm | 67675 | 2022-02-16 19:39:50 |
| R56.htm | 39491 | 2022-02-16 19:39:50 |
| R57.htm | 12340 | 2022-02-16 19:39:50 |
| R58.htm | 31162 | 2022-02-16 19:39:50 |
| R59.htm | 20197 | 2022-02-16 19:39:50 |
| R6.htm | 115134 | 2022-02-16 19:39:50 |
| R60.htm | 9559 | 2022-02-16 19:39:50 |
| R61.htm | 53402 | 2022-02-16 19:39:50 |
| R62.htm | 21492 | 2022-02-16 19:39:50 |
| R63.htm | 14706 | 2022-02-16 19:39:50 |
| R64.htm | 18395 | 2022-02-16 19:39:50 |
| R65.htm | 32901 | 2022-02-16 19:39:50 |
| R66.htm | 8325 | 2022-02-16 19:39:50 |
| R67.htm | 8357 | 2022-02-16 19:39:50 |
| R68.htm | 23600 | 2022-02-16 19:39:50 |
| R69.htm | 37923 | 2022-02-16 19:39:50 |
| R7.htm | 47369 | 2022-02-16 19:39:50 |
| R70.htm | 58053 | 2022-02-16 19:39:50 |
| R71.htm | 16885 | 2022-02-16 19:39:50 |
| R72.htm | 14115 | 2022-02-16 19:39:50 |
| R73.htm | 28836 | 2022-02-16 19:39:50 |
| R74.htm | 8445 | 2022-02-16 19:39:50 |
| R75.htm | 32342 | 2022-02-16 19:39:50 |
| R76.htm | 24313 | 2022-02-16 19:39:50 |
| R77.htm | 23133 | 2022-02-16 19:39:50 |
| R78.htm | 21120 | 2022-02-16 19:39:50 |
| R79.htm | 19224 | 2022-02-16 19:39:50 |
| R8.htm | 11075 | 2022-02-16 19:39:50 |
| R80.htm | 30167 | 2022-02-16 19:39:50 |
| R81.htm | 68636 | 2022-02-16 19:39:50 |
| R82.htm | 123151 | 2022-02-16 19:39:50 |
| R83.htm | 35252 | 2022-02-16 19:39:50 |
| R84.htm | 20934 | 2022-02-16 19:39:50 |
| R85.htm | 26460 | 2022-02-16 19:39:50 |
| R86.htm | 37448 | 2022-02-16 19:39:50 |
| R87.htm | 23219 | 2022-02-16 19:39:50 |
| R88.htm | 22900 | 2022-02-16 19:39:50 |
| R89.htm | 25902 | 2022-02-16 19:39:50 |
| R9.htm | 51048 | 2022-02-16 19:39:50 |
| R90.htm | 18756 | 2022-02-16 19:39:50 |
| R91.htm | 14311 | 2022-02-16 19:39:50 |
| R92.htm | 22715 | 2022-02-16 19:39:50 |
| R93.htm | 12904 | 2022-02-16 19:39:50 |
| R94.htm | 27335 | 2022-02-16 19:39:50 |
| R95.htm | 10012 | 2022-02-16 19:39:50 |
| R96.htm | 45483 | 2022-02-16 19:39:50 |
| R97.htm | 14436 | 2022-02-16 19:39:50 |
| R98.htm | 4820 | 2022-02-16 19:39:50 |
| R99.htm | 13432 | 2022-02-16 19:39:50 |
| report.css | 2768 | 2022-02-16 19:39:50 |
| Show.js | 1086 | 2022-02-16 19:39:50 |