Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000357173-20-000029-index-headers.html | 2020-05-08 17:55:46 | |
| 0000357173-20-000029-index.html | 2020-05-08 17:55:46 | |
| 0000357173-20-000029.txt | 2020-05-08 17:55:46 | |
 0000357173-20-000029-xbrl.zip | 346897 | 2020-05-08 17:55:46 |
| FilingSummary.xml | 43832 | 2020-05-08 17:55:46 |
| Financial_Report.xlsx | 132281 | 2020-05-08 17:55:46 |
| osbc-20200331.xml | 8503413 | 2020-05-08 17:55:46 |
| osbc-20200331.xsd | 87943 | 2020-05-08 17:55:46 |
| osbc-20200331ex311a6b0ab.htm | 20142 | 2020-05-08 17:55:46 |
| osbc-20200331ex312a99e16.htm | 20589 | 2020-05-08 17:55:46 |
| osbc-20200331ex3210b4283.htm | 10985 | 2020-05-08 17:55:46 |
| osbc-20200331ex322c16c4c.htm | 9516 | 2020-05-08 17:55:46 |
| osbc-20200331x10q.htm | 7204618 | 2020-05-08 17:55:46 |
| osbc-20200331_cal.xml | 110691 | 2020-05-08 17:55:46 |
| osbc-20200331_def.xml | 469510 | 2020-05-08 17:55:46 |
| osbc-20200331_lab.xml | 882644 | 2020-05-08 17:55:46 |
| osbc-20200331_pre.xml | 708440 | 2020-05-08 17:55:46 |
 osbc20200331x10q001.jpg | 42617 | 2020-05-08 17:55:46 |
| R1.htm | 29256 | 2020-05-08 17:55:46 |
| R10.htm | 6831 | 2020-05-08 17:55:46 |
| R11.htm | 417425 | 2020-05-08 17:55:46 |
| R12.htm | 1710214 | 2020-05-08 17:55:46 |
| R13.htm | 86299 | 2020-05-08 17:55:46 |
| R14.htm | 33893 | 2020-05-08 17:55:46 |
| R15.htm | 36158 | 2020-05-08 17:55:46 |
| R16.htm | 9265 | 2020-05-08 17:55:46 |
| R17.htm | 35115 | 2020-05-08 17:55:46 |
| R18.htm | 60119 | 2020-05-08 17:55:46 |
| R19.htm | 233880 | 2020-05-08 17:55:46 |
| R2.htm | 89324 | 2020-05-08 17:55:46 |
| R20.htm | 426313 | 2020-05-08 17:55:46 |
| R21.htm | 289026 | 2020-05-08 17:55:46 |
| R22.htm | 208569 | 2020-05-08 17:55:46 |
| R23.htm | 57667 | 2020-05-08 17:55:46 |
| R24.htm | 414320 | 2020-05-08 17:55:46 |
| R25.htm | 1709326 | 2020-05-08 17:55:46 |
| R26.htm | 87924 | 2020-05-08 17:55:46 |
| R27.htm | 32151 | 2020-05-08 17:55:46 |
| R28.htm | 31323 | 2020-05-08 17:55:46 |
| R29.htm | 27550 | 2020-05-08 17:55:46 |
| R3.htm | 12899 | 2020-05-08 17:55:46 |
| R30.htm | 59583 | 2020-05-08 17:55:46 |
| R31.htm | 221758 | 2020-05-08 17:55:46 |
| R32.htm | 410277 | 2020-05-08 17:55:46 |
| R33.htm | 286791 | 2020-05-08 17:55:46 |
| R34.htm | 187595 | 2020-05-08 17:55:46 |
| R35.htm | 22613 | 2020-05-08 17:55:46 |
| R36.htm | 14217 | 2020-05-08 17:55:46 |
| R37.htm | 33719 | 2020-05-08 17:55:46 |
| R38.htm | 9750 | 2020-05-08 17:55:46 |
| R39.htm | 81682 | 2020-05-08 17:55:46 |
| R4.htm | 114303 | 2020-05-08 17:55:46 |
| R40.htm | 68956 | 2020-05-08 17:55:46 |
| R41.htm | 60450 | 2020-05-08 17:55:46 |
| R42.htm | 18149 | 2020-05-08 17:55:46 |
| R43.htm | 63509 | 2020-05-08 17:55:46 |
| R44.htm | 13956 | 2020-05-08 17:55:46 |
| R45.htm | 61262 | 2020-05-08 17:55:46 |
| R46.htm | 78553 | 2020-05-08 17:55:46 |
| R47.htm | 154133 | 2020-05-08 17:55:46 |
| R48.htm | 44273 | 2020-05-08 17:55:46 |
| R49.htm | 213931 | 2020-05-08 17:55:46 |
| R5.htm | 40062 | 2020-05-08 17:55:46 |
| R50.htm | 42971 | 2020-05-08 17:55:46 |
| R51.htm | 34053 | 2020-05-08 17:55:46 |
| R52.htm | 18019 | 2020-05-08 17:55:46 |
| R53.htm | 16726 | 2020-05-08 17:55:46 |
| R54.htm | 92916 | 2020-05-08 17:55:46 |
| R55.htm | 56148 | 2020-05-08 17:55:46 |
| R56.htm | 23713 | 2020-05-08 17:55:46 |
| R57.htm | 12933 | 2020-05-08 17:55:46 |
| R58.htm | 27425 | 2020-05-08 17:55:46 |
| R59.htm | 30985 | 2020-05-08 17:55:46 |
| R6.htm | 106140 | 2020-05-08 17:55:46 |
| R60.htm | 31485 | 2020-05-08 17:55:46 |
| R61.htm | 75374 | 2020-05-08 17:55:46 |
| R62.htm | 12833 | 2020-05-08 17:55:46 |
| R63.htm | 89731 | 2020-05-08 17:55:46 |
| R64.htm | 30227 | 2020-05-08 17:55:46 |
| R65.htm | 33614 | 2020-05-08 17:55:46 |
| R66.htm | 30473 | 2020-05-08 17:55:46 |
| R67.htm | 71158 | 2020-05-08 17:55:46 |
| R68.htm | 69773 | 2020-05-08 17:55:46 |
| R69.htm | 9947 | 2020-05-08 17:55:46 |
| R7.htm | 38430 | 2020-05-08 17:55:46 |
| R70.htm | 31617 | 2020-05-08 17:55:46 |
| R8.htm | 19199 | 2020-05-08 17:55:46 |
| R9.htm | 67183 | 2020-05-08 17:55:46 |
| report.css | 2767 | 2020-05-08 17:55:46 |
| Show.js | 1085 | 2020-05-08 17:55:46 |