XML 38 R28.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Deposits (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2015
Deposits |
Schedule of major classifications of deposits |
|  | March 31, 2015 |  | December 31, 2014 |
Noninterest bearing demand |  | $ | 431,843 |  | $ | 400,447 |
Savings |  |  | 252,578 |  |  | 239,845 |
NOW accounts |  |  | 344,737 |  |  | 328,641 |
Money market accounts |  |  | 299,303 |  |  | 296,617 |
Certificates of deposit of less than $100,000 |  |  | 247,132 |  |  | 251,108 |
Certificates of deposit of $100,000 through $250,000 |  |  | 113,160 |  |  | 112,515 |
Certificates of deposit of more than $250,000 |  |  | 56,025 |  |  | 55,882 |
|  | $ | 1,744,778 |  | $ | 1,685,055 |

X
- Definition Tabular disclosure of different types of deposits liabilities held by the entity. + References No definition available. + Details
Name: | osbc_ScheduleOfDepositsTableTextBlock
Namespace Prefix: | osbc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DepositsByTypeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration