XML 61 R48.htm IDEA: XBRL DOCUMENT v3.10.0.1

Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Aged analysis of past due loans
Total Past Due	$ 10,509	$ 5,606
Current	1,826,255	1,597,628
Nonaccrual	12,398	14,388
Total Loans	1,849,162	1,617,622	$ 1,539,647
Recorded Investment 90 days or Greater Past Due and Accruing	1,220	254
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	8,868	4,212
60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	488	1,146
90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	1,153	248
PCI
Aged analysis of past due loans
Total Past Due	387
Current	7,850
Nonaccrual	2,977
Total Loans	11,214
PCI | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	387
Non-PCI
Aged analysis of past due loans
Total Past Due	10,122
Current	1,818,405
Nonaccrual	9,421
Total Loans	1,837,948	1,617,622
Recorded Investment 90 days or Greater Past Due and Accruing	1,220
Non-PCI | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	8,481
Non-PCI | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	488
Non-PCI | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	1,153
Multifamily
Aged analysis of past due loans
Total Past Due	232
Current	191,883	125,049
Nonaccrual		4,723
Total Loans	192,115	129,772
Multifamily | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	232
Commercial
Aged analysis of past due loans
Total Past Due	210	1,270
Current	299,326	271,581
Total Loans	299,536	272,851	256,760
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	210	995
Commercial | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		275
Lease financing receivables
Aged analysis of past due loans
Current	66,687	68,147
Nonaccrual		178
Total Loans	66,687	68,325	70,138
Real estate - commercial
Aged analysis of past due loans
Total Loans			706,103
Real estate - commercial | Owner occupied general purpose
Aged analysis of past due loans
Total Past Due	1,353	1,136
Current	172,922	144,267
Nonaccrual	823	455
Total Loans	175,098	145,858
Recorded Investment 90 days or Greater Past Due and Accruing	477
Real estate - commercial | Owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	903	1,136
Real estate - commercial | Owner occupied general purpose | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	450
Real estate - commercial | Owner occupied special purpose
Aged analysis of past due loans
Total Past Due	1,981	226
Current	194,604	170,546
Nonaccrual	426	342
Total Loans	197,011	171,114
Real estate - commercial | Owner occupied special purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,981	226
Real estate - commercial | Non-owner occupied general purpose
Aged analysis of past due loans
Total Past Due	3,456	593
Current	279,599	273,203
Nonaccrual	39	1,163
Total Loans	283,094	274,959
Recorded Investment 90 days or Greater Past Due and Accruing	178
Real estate - commercial | Non-owner occupied general purpose | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	3,282
Real estate - commercial | Non-owner occupied general purpose | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		593
Real estate - commercial | Non-owner occupied general purpose | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	174
Real estate - commercial | Non-owner occupied special purpose
Aged analysis of past due loans
Total Past Due		248
Current	87,704	92,923
Nonaccrual	3,099
Total Loans	90,803	93,171
Recorded Investment 90 days or Greater Past Due and Accruing		254
Real estate - commercial | Non-owner occupied special purpose | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due		248
Real estate - commercial | Retail properties
Aged analysis of past due loans
Current	47,582	49,538
Nonaccrual		1,081
Total Loans	47,582	50,619
Real estate - commercial | Farm
Aged analysis of past due loans
Current	14,676	15,270
Total Loans	14,676	15,270
Real estate - commercial | Construction Loans
Aged analysis of past due loans
Total Loans			93,661
Real estate - commercial | Construction Loans | Homebuilder
Aged analysis of past due loans
Total Past Due		129
Current	7,649	2,221
Total Loans	7,649	2,350
Real estate - commercial | Construction Loans | Homebuilder | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		129
Real estate - commercial | Construction Loans | Land
Aged analysis of past due loans
Total Past Due		1,124
Current	9,168	1,319
Total Loans	9,168	2,443
Real estate - commercial | Construction Loans | Land | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		1,124
Real estate - commercial | Construction Loans | Commercial speculative
Aged analysis of past due loans
Current	39,730	32,028
Total Loans	39,730	32,028
Real estate - commercial | Construction Loans | All other
Aged analysis of past due loans
Total Past Due	501
Current	58,245	48,140
Nonaccrual	193	201
Total Loans	58,939	48,341
Recorded Investment 90 days or Greater Past Due and Accruing	475
Real estate - commercial | Construction Loans | All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	59
Real estate - commercial | Construction Loans | All other | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	442
Real estate - residential
Aged analysis of past due loans
Total Loans			282,118
Real estate - residential | Investor
Aged analysis of past due loans
Total Past Due	612
Current	72,896	55,248
Nonaccrual	371	372
Total Loans	73,879	55,620
Recorded Investment 90 days or Greater Past Due and Accruing	40
Real estate - residential | Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	466
Real estate - residential | Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	108
Real estate - residential | Investor | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	38
Real estate - residential | Owner occupied
Aged analysis of past due loans
Total Past Due	918	74
Current	134,265	123,257
Nonaccrual	3,731	4,674
Total Loans	138,914	128,005
Real estate - residential | Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	710	74
Real estate - residential | Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	208
Real estate - residential | Home Equity Line of Credit
Aged analysis of past due loans
Total Past Due	820	769
Current	126,443	110,872
Nonaccrual	723	1,192
Total Loans	127,986	112,833
Recorded Investment 90 days or Greater Past Due and Accruing	50
Real estate - residential | Home Equity Line of Credit | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	599	491
Real estate - residential | Home Equity Line of Credit | 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	172	278
Real estate - residential | Home Equity Line of Credit | 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	49
Consumer
Aged analysis of past due loans
Total Loans			116,052
All other
Aged analysis of past due loans
Total Past Due	39	37
Current	15,026	14,019
Nonaccrual	16	7
Total Loans	15,081	14,063	$ 14,815
All other | 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	$ 39	$ 37

X

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

+ Details

Name:	us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	osbc_CreditLossStatusAxis=osbc_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	osbc_CreditLossStatusAxis=osbc_FinancialAssetAcquiredAndNoCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_MultiFamilyLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_CommercialRealEstateOwnerOccupiedGeneralPurposeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_CommercialRealEstateOwnerOccupiedSpecialPurposeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_CommercialRealEstateNonOwnerOccupiedGeneralPurposeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_CommercialRealEstateNonOwnerOccupiedSpecialPurposeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_CommercialRealEstateRetailPropertiesLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_CommercialRealEstateFarmLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_ConstructionRealEstateHomebuilderLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_ConstructionRealEstateLandLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_ConstructionRealEstateCommercialSpeculativeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_ConstructionRealEstateOtherReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_ResidentialInvestorLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=osbc_ResidentialOwnerOccupiedLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_UnallocatedFinancingReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: