XML 53 R24.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2015
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, 2015: |  | Cost |  | Gains |  | Losses |  | Value
Securities Available-for-Sale |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 1,514 |  | $ | 1 |  | $ | - |  | $ | 1,515
U.S. government agencies |  |  | 1,690 |  |  | - |  |  | (113) |  |  | 1,577
U.S. government agencies mortgage-backed |  |  | 2,049 |  |  | - |  |  | (15) |  |  | 2,034
States and political subdivisions |  |  | 22,918 |  |  | 401 |  |  | (149) |  |  | 23,170
Corporate bonds |  |  | 30,160 |  |  | - |  |  | (580) |  |  | 29,580
Collateralized mortgage obligations |  |  | 72,015 |  |  | 53 |  |  | (1,191) |  |  | 70,877
Asset-backed securities |  |  | 195,100 |  |  | 49 |  |  | (8,053) |  |  | 187,096
Collateralized loan obligations |  |  | 94,265 |  |  | - |  |  | (1,278) |  |  | 92,987
Total Securities Available-for-Sale |  | $ | 419,711 |  | $ | 504 |  | $ | (11,379) |  | $ | 408,836
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency mortgage-backed |  | $ | 36,746 |  | $ | 2,442 |  | $ | - |  | $ | 39,188
Collateralized mortgage obligations |  |  | 213,298 |  |  | 5,746 |  |  | (24) |  |  | 219,020
Total Securities Held-to-Maturity |  | $ | 250,044 |  | $ | 8,188 |  | $ | (24) |  | $ | 258,208
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
December 31, 2014: |  | Cost |  | Gains |  | Losses |  | Value
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 1,529 |  | $ | - |  | $ | (2) |  | $ | 1,527
U.S. government agencies |  |  | 1,711 |  |  | - |  |  | (87) |  |  | 1,624
States and political subdivisions |  |  | 21,682 |  |  | 432 |  |  | (96) |  |  | 22,018
Corporate bonds |  |  | 31,243 |  |  | 309 |  |  | (567) |  |  | 30,985
Collateralized mortgage obligations |  |  | 65,728 |  |  | 31 |  |  | (2,132) |  |  | 63,627
Asset-backed securities |  |  | 175,565 |  |  | 199 |  |  | (2,268) |  |  | 173,496
Collateralized loan obligations |  |  | 94,236 |  |  | 176 |  |  | (2,203) |  |  | 92,209
Total Securities Available-for-Sale |  | $ | 391,694 |  | $ | 1,147 |  | $ | (7,355) |  | $ | 385,486
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency mortgage-backed |  | $ | 37,125 |  | $ | 2,030 |  | $ | - |  | $ | 39,155
Collateralized mortgage obligations |  |  | 222,545 |  |  | 3,005 |  |  | (1,439) |  |  | 224,111
Total Securities Held-to-Maturity |  | $ | 259,670 |  | $ | 5,035 |  | $ | (1,439) |  | $ | 263,266
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 |  | $ | 12,136 |  | 1.52 | % |  | $ | 12,159 |
Due after one year through five years |  |  | 6,898 |  | 2.90 | % |  |  | 7,092 |
Due after five years through ten years |  |  | 33,586 |  | 2.39 | % |  |  | 33,077 |
Due after ten years |  |  | 3,662 |  | 2.82 | % |  |  | 3,514 |
|  |  | 56,282 |  | 2.29 | % |  |  | 55,842 |
Mortgage-backed and collateralized mortgage obligations |  |  | 74,064 |  | 1.30 | % |  |  | 72,911 |
Asset-backed securities |  |  | 195,100 |  | 1.26 | % |  |  | 187,096 |
Collateralized loan obligations |  |  | 94,265 |  | 2.87 | % |  |  | 92,987 |
|  | $ | 419,711 |  | 1.77 | % |  | $ | 408,836 |
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |
Mortgage-backed and collateralized mortgage obligations |  | $ | 250,044 |  | 2.98 | % |  | $ | 258,208 |
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, 2015 |  | 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. government agencies |  | - |  | $ | - |  | $ | - |  | 1 |  | $ | 113 |  | $ | 1,577 |  | 1 |  | $ | 113 |  | $ | 1,577
U.S. government agencies mortgage-backed |  | 1 |  |  | 15 |  |  | 2,034 |  | - |  |  | - |  |  | - |  | 1 |  |  | 15 |  |  | 2,034
States and political subdivisions |  | 1 |  |  | 28 |  |  | 1,490 |  | 1 |  |  | 121 |  |  | 1,703 |  | 2 |  |  | 149 |  |  | 3,193
Corporate bonds |  | 5 |  |  | 160 |  |  | 15,000 |  | 3 |  |  | 420 |  |  | 14,580 |  | 8 |  |  | 580 |  |  | 29,580
Collateralized mortgage obligations |  | 7 |  |  | 386 |  |  | 43,651 |  | 4 |  |  | 805 |  |  | 19,211 |  | 11 |  |  | 1,191 |  |  | 62,862
Asset-backed securities |  | 9 |  |  | 2,499 |  |  | 74,269 |  | 6 |  |  | 5,554 |  |  | 93,838 |  | 15 |  |  | 8,053 |  |  | 168,107
Collateralized loan obligations |  | 5 |  |  | 212 |  |  | 29,684 |  | 9 |  |  | 1,066 |  |  | 63,303 |  | 14 |  |  | 1,278 |  |  | 92,987
|  | 28 |  | $ | 3,300 |  | $ | 166,128 |  | 24 |  | $ | 8,079 |  | $ | 194,212 |  | 52 |  | $ | 11,379 |  | $ | 360,340
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized mortgage obligations |  | - |  | $ | - |  | $ | - |  | 2 |  | $ | 24 |  | $ | 34,550 |  | 2 |  | $ | 24 |  | $ | 34,550
|  | - |  | $ | - |  | $ | - |  | 2 |  | $ | 24 |  | $ | 34,550 |  | 2 |  | $ | 24 |  | $ | 34,550
|  | Less than 12 months |  | Greater than 12 months |  |  |  |  |  |  |  |
December 31, 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 |  | $ | 2 |  | $ | 1,527 |  | - |  | $ | - |  | $ | - |  | 1 |  | $ | 2 |  | $ | 1,527
U.S. government agencies |  | - |  |  | - |  |  | - |  | 1 |  |  | 87 |  |  | 1,624 |  | 1 |  |  | 87 |  |  | 1,624
States and political subdivisions |  | 4 |  |  | 96 |  |  | 4,896 |  | - |  |  | - |  |  | - |  | 4 |  |  | 96 |  |  | 4,896
Corporate bonds |  | 4 |  |  | 486 |  |  | 15,246 |  | 1 |  |  | 81 |  |  | 1,921 |  | 5 |  |  | 567 |  |  | 17,167
Collateralized mortgage obligations |  | 5 |  |  | 900 |  |  | 38,284 |  | 3 |  |  | 1,232 |  |  | 21,604 |  | 8 |  |  | 2,132 |  |  | 59,888
Asset-backed securities |  | 9 |  |  | 1,077 |  |  | 99,286 |  | 3 |  |  | 1,191 |  |  | 43,662 |  | 12 |  |  | 2,268 |  |  | 142,948
Collateralized loan obligations |  | 12 |  |  | 2,203 |  |  | 82,387 |  | - |  |  | - |  |  | - |  | 12 |  |  | 2,203 |  |  | 82,387
|  | 35 |  | $ | 4,764 |  | $ | 241,626 |  | 8 |  | $ | 2,591 |  | $ | 68,811 |  | 43 |  | $ | 7,355 |  | $ | 310,437
Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized mortgage obligations |  | 7 |  | $ | 457 |  | $ | 49,302 |  | 4 |  | $ | 982 |  | $ | 46,283 |  | 11 |  | $ | 1,439 |  | $ | 95,585
|  | 7 |  | $ | 457 |  | $ | 49,302 |  | 4 |  | $ | 982 |  | $ | 46,283 |  | 11 |  | $ | 1,439 |  | $ | 95,585

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
- References No definition available. + 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