XML 40 R28.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Deposits (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2017
Deposits |
Schedule of major classifications of deposits |
|  | March 31, 2017 |  | December 31, 2016 |
Noninterest bearing demand |  | $ | 559,666 |  | $ | 513,688 |
Savings |  |  | 266,007 |  |  | 256,159 |
NOW accounts |  |  | 439,276 |  |  | 419,417 |
Money market accounts |  |  | 286,417 |  |  | 275,273 |
Certificates of deposit of less than $100,000 |  |  | 222,754 |  |  | 228,993 |
Certificates of deposit of $100,000 through $250,000 |  |  | 105,728 |  |  | 110,992 |
Certificates of deposit of more than $250,000 |  |  | 57,306 |  |  | 62,263 |
Total deposits |  | $ | 1,937,154 |  | $ | 1,866,785 |

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
- References No definition available. + Details
Name: | us-gaap_DepositsByTypeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration