XML 51 R24.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2014
Securities |
Schedule of amortized cost and fair value of the securities portfolio and corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive loss |
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
September 30, 2014: |  | Cost |  | Gains |  | Losses |  | Value
Securities Available-for-Sale |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 1,533 |  | $ | - |  | $ | (1) |  | $ | 1,532
U.S. government agencies |  |  | 1,718 |  |  | - |  |  | (80) |  |  | 1,638
States and political subdivisions |  |  | 13,794 |  |  | 313 |  |  | (228) |  |  | 13,879
Corporate bonds |  |  | 31,272 |  |  | 65 |  |  | (556) |  |  | 30,781
Collateralized mortgage obligations |  |  | 29,951 |  |  | 41 |  |  | (1,575) |  |  | 28,417
Asset-backed securities |  |  | 194,927 |  |  | 98 |  |  | (2,227) |  |  | 192,798
Collateralized loan obligations |  |  | 94,202 |  |  | - |  |  | (1,004) |  |  | 93,198
Total Securities Available-for-Sale |  | $ | 367,397 |  | $ | 517 |  | $ | (5,671) |  | $ | 362,243
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency mortgage-backed |  | $ | 37,321 |  | $ | 1,346 |  | $ | (11) |  | $ | 38,656
Collateralized mortgage obligations |  |  | 225,719 |  |  | 2,017 |  |  | (2,049) |  |  | 225,687
Total Securities Held-to-Maturity |  | $ | 263,040 |  | $ | 3,363 |  | $ | (2,060) |  | $ | 264,343
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
December 31, 2013: |  | Cost |  | Gains |  | Losses |  | Value
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 1,549 |  | $ | - |  | $ | (5) |  | $ | 1,544
U.S. government agencies |  |  | 1,738 |  |  | - |  |  | (66) |  |  | 1,672
States and political subdivisions |  |  | 16,382 |  |  | 629 |  |  | (217) |  |  | 16,794
Corporate bonds |  |  | 15,733 |  |  | 17 |  |  | (648) |  |  | 15,102
Collateralized mortgage obligations |  |  | 66,766 |  |  | 256 |  |  | (3,146) |  |  | 63,876
Asset-backed securities |  |  | 274,118 |  |  | 2,168 |  |  | (3,083) |  |  | 273,203
Total Securities Available-for-Sale |  | $ | 376,286 |  | $ | 3,070 |  | $ | (7,165) |  | $ | 372,191
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency mortgage-backed |  | $ | 35,268 |  | $ | 45 |  | $ | (73) |  | $ | 35,240
Collateralized mortgage obligations |  |  | 221,303 |  |  | 643 |  |  | (2,858) |  |  | 219,088
Total Securities Held-to-Maturity |  | $ | 256,571 |  | $ | 688 |  | $ | (2,931) |  | $ | 254,328
Schedule of fair value, amortized cost and weighted average yield of debt securities by contractual maturity along with securities not due at a single maturity date, primarily mortgage-backed securities (MBS), asset-backed securities, and collateralized loan obligations |
|  |  |  |  | Weighted |  |  |
|  | Amortized |  | Average |  | Fair
Securities Available-for-Sale |  | Cost |  | Yield |  | Value
Due in one year or less |  | $ | 410 |  | 4.50% |  | $ | 421
Due after one year through five years |  |  | 5,811 |  | 2.87% |  |  | 5,992
Due after five years through ten years |  |  | 36,724 |  | 2.44% |  |  | 36,218
Due after ten years |  |  | 5,372 |  | 3.31% |  |  | 5,199
|  |  | 48,317 |  | 2.61% |  |  | 47,830
Collateralized mortgage obligations |  |  | 29,951 |  | 2.46% |  |  | 28,417
Asset-back securities |  |  | 194,927 |  | 2.10% |  |  | 192,798
Collateralized loan obligations |  |  | 94,202 |  | 2.78% |  |  | 93,198
|  | $ | 367,397 |  | 2.37% |  | $ | 362,243
Securities Held-to-Maturity |  |  |  |  |  |  |  |
Mortgage-backed and collateralized mortgage obligations |  | $ | 263,040 |  | 3.05% |  | $ | 264,343
Schedule of securities with unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position |
|  | Less than 12 months |  | Greater than 12 months |  |  |  |  |  |  |  |
September 30, 2014 |  | in an unrealized loss position |  | in an unrealized loss position |  | Total
|  | Number of |  | Unrealized |  | Fair |  | Number of |  | Unrealized |  | Fair |  | Number of |  | Unrealized |  | Fair
Securities Available-for-Sale |  | Securities |  | Losses |  | Value |  | Securities |  | Losses |  | Value |  | Securities |  | Losses |  | Value
U.S. Treasury |  | 1 |  | $ | 1 |  | $ | 1,532 |  | - |  | $ | - |  | $ | - |  | 1 |  | $ | 1 |  | $ | 1,532
U.S. government agencies |  | - |  |  | - |  |  | - |  | 1 |  |  | 80 |  |  | 1,638 |  | 1 |  |  | 80 |  |  | 1,638
States and political subdivisions |  | 3 |  |  | 215 |  |  | 4,450 |  | 2 |  |  | 13 |  |  | 1,862 |  | 5 |  |  | 228 |  |  | 6,312
Corporate bonds |  | 5 |  |  | 463 |  |  | 20,581 |  | 2 |  |  | 93 |  |  | 2,411 |  | 7 |  |  | 556 |  |  | 22,992
Collateralized mortgage obligations |  | 1 |  |  | 18 |  |  | 4,739 |  | 3 |  |  | 1,557 |  |  | 21,704 |  | 4 |  |  | 1,575 |  |  | 26,443
Asset-backed securities |  | 10 |  |  | 1,231 |  |  | 117,440 |  | 3 |  |  | 996 |  |  | 44,042 |  | 13 |  |  | 2,227 |  |  | 161,482
Collateralized loan obligations |  | 13 |  |  | 1,004 |  |  | 93,198 |  | - |  |  | - |  |  | - |  | 13 |  |  | 1,004 |  |  | 93,198
|  | 33 |  | $ | 2,932 |  | $ | 241,940 |  | 11 |  | $ | 2,739 |  | $ | 71,657 |  | 44 |  | $ | 5,671 |  | $ | 313,597
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency mortgage-backed |  | 1 |  | $ | 11 |  | $ | 1,972 |  | - |  | $ | - |  | $ | - |  | 1 |  | $ | 11 |  | $ | 1,972
Collateralized mortgage obligations |  | 13 |  |  | 1,164 |  |  | 83,545 |  | 2 |  |  | 885 |  |  | 37,828 |  | 15 |  |  | 2,049 |  |  | 121,373
|  | 14 |  | $ | 1,175 |  | $ | 85,517 |  | 2 |  | $ | 885 |  | $ | 37,828 |  | 16 |  | $ | 2,060 |  | $ | 123,345
|  | Less than 12 months |  | Greater than 12 months |  |  |  |  |  |  |  |
December 31, 2013 |  | in an unrealized loss position |  | in an unrealized loss position |  | Total
|  | Number of |  | Unrealized |  |  | Fair |  | Number of |  | Unrealized |  |  | Fair |  | Number of |  | Unrealized |  |  | Fair
Securities Available-for-Sale |  | Securities |  | Losses |  |  | Value |  | Securities |  | Losses |  |  | Value |  | Securities |  | Losses |  |  | Value
U.S. Treasury |  | 1 |  | $ | 5 |  | $ | 1,544 |  | - |  | $ | - |  | $ | - |  | 1 |  | $ | 5 |  | $ | 1,544
U.S. government agencies |  | - |  |  | - |  |  | - |  | 1 |  |  | 66 |  |  | 1,672 |  | 1 |  |  | 66 |  |  | 1,672
States and political subdivisions |  | 6 |  |  | 217 |  |  | 4,625 |  | - |  |  | - |  |  | - |  | 6 |  |  | 217 |  |  | 4,625
Corporate bonds |  | 4 |  |  | 429 |  |  | 10,493 |  | 2 |  |  | 219 |  |  | 2,796 |  | 6 |  |  | 648 |  |  | 13,289
Collateralized mortgage obligations |  | 5 |  |  | 3,146 |  |  | 54,021 |  | - |  |  | - |  |  | - |  | 5 |  |  | 3,146 |  |  | 54,021
Asset-backed securities |  | 11 |  |  | 2,836 |  |  | 99,466 |  | 2 |  |  | 247 |  |  | 6,368 |  | 13 |  |  | 3,083 |  |  | 105,834
|  | 27 |  | $ | 6,633 |  | $ | 170,149 |  | 5 |  | $ | 532 |  | $ | 10,836 |  | 32 |  | $ | 7,165 |  | $ | 180,985
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency mortgage-backed |  | 6 |  | $ | 73 |  | $ | 19,134 |  | - |  | $ | - |  | $ | - |  | 6 |  | $ | 73 |  | $ | 19,134
Collateralized mortgage obligations |  | 19 |  |  | 2,858 |  |  | 156,632 |  | - |  |  | - |  |  | - |  | 19 |  |  | 2,858 |  |  | 156,632
|  | 25 |  | $ | 2,931 |  | $ | 175,766 |  | - |  | $ | - |  | $ | - |  | 25 |  | $ | 2,931 |  | $ | 175,766

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities and held-to-maturity securities from cost basis to fair value. + References No definition available. + Details
Name: | osbc_ScheduleOfAvailableForSaleSecuritiesAndHeldToMaturitySecuritiesReconciliationTableTextBlock
Namespace Prefix: | osbc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration