XML 69 R57.htm IDEA: XBRL DOCUMENT
v3.19.1

Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Allowance for loan losses: |  |  |
Beginning Balance | $ 19,006 | $ 17,461 |
Charge-offs | 345 | (25) |
Recoveries | 205 | 1,424 |
Provision (release) | 450 | (722) |
Ending Balance | 19,316 | 18,188 |
Ending balance: Individually evaluated for impairment | 222 | 588 |
Ending balance: Collectively evaluated for impairment | 19,094 | 17,600 |
Loans: |  |  |
Ending balance | 1,903,146 | 1,601,812 | $ 1,897,027
Ending balance | 1,903,146 |  |
Ending balance: Individually evaluated for impairment | 19,823 | 17,230 |
Ending balance: Collectively evaluated for impairment | 1,872,472 | 1,584,582 |
Ending balance: Acquired and accounted for ASC 310-30 | 10,851 |  |
Commercial Portfolio Segment [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 2,832 | 2,453 |
Charge-offs | 12 | 16 |
Recoveries | 30 | 17 |
Provision (release) | 202 | 150 |
Ending Balance | 3,052 | 2,604 |
Ending balance: Collectively evaluated for impairment | 3,052 | 2,604 |
Loans: |  |  |
Ending balance | 324,450 | 281,134 | 314,323
Ending balance | 324,450 |  |
Ending balance: Collectively evaluated for impairment | 324,450 | 281,134 |
Finance Leases Financing Receivable [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 734 | 692 |
Charge-offs |  | 5 |
Provision (release) | 71 | (70) |
Ending Balance | 805 | 617 |
Ending balance: Collectively evaluated for impairment | 805 | 617 |
Loans: |  |  |
Ending balance | 87,730 | 66,344 | 78,806
Ending balance | 87,730 |  |
Ending balance: Individually evaluated for impairment | 114 |  |
Ending balance: Collectively evaluated for impairment | 87,616 | 66,344 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 10,470 | 9,522 |
Charge-offs | 231 | (96) |
Recoveries | 23 | 367 |
Provision (release) | (242) | (420) |
Ending Balance | 10,020 | 9,565 |
Ending balance: Individually evaluated for impairment | 93 | 503 |
Ending balance: Collectively evaluated for impairment | 9,927 | 9,062 |
Loans: |  |  |
Ending balance |  | 713,422 |
Ending balance | 840,006 |  |
Ending balance: Individually evaluated for impairment | 9,004 | 4,740 |
Ending balance: Collectively evaluated for impairment | 826,900 | 708,682 |
Ending balance: Acquired and accounted for ASC 310-30 | 4,102 |  |
Residential Portfolio Segment [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 1,931 | 1,846 |
Charge-offs | 18 | (60) |
Recoveries | 50 | 911 |
Provision (release) | (7) | (963) |
Ending Balance | 1,956 | 1,854 |
Ending balance: Individually evaluated for impairment | 46 | 85 |
Ending balance: Collectively evaluated for impairment | 1,910 | 1,769 |
Loans: |  |  |
Ending balance |  | 309,376 |
Ending balance | 405,905 |  |
Ending balance: Individually evaluated for impairment | 8,190 | 10,008 |
Ending balance: Collectively evaluated for impairment | 391,676 | 299,368 |
Ending balance: Acquired and accounted for ASC 310-30 | 6,039 |  |
Consumer Portfolio Segment [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 1,449 | 1,446 |
Charge-offs |  | 27 |
Recoveries | 46 | 47 |
Provision (release) | (170) | 69 |
Ending Balance | 1,325 | 1,535 |
Ending balance: Individually evaluated for impairment | 71 |  |
Ending balance: Collectively evaluated for impairment | 1,254 | 1,535 |
Loans: |  |  |
Ending balance |  | 129,234 |
Ending balance | 133,859 |  |
Ending balance: Individually evaluated for impairment | 2,384 | 2,268 |
Ending balance: Collectively evaluated for impairment | 131,475 | 126,966 |
Unallocated Financing Receivables [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 621 | 579 |
Charge-offs | 84 | 99 |
Recoveries | 57 | 79 |
Provision (release) | 764 | 311 |
Ending Balance | 1,358 | 870 |
Ending balance: Individually evaluated for impairment | 12 |  |
Ending balance: Collectively evaluated for impairment | 1,346 | 870 |
Loans: |  |  |
Ending balance | 15,699 | 10,823 | $ 16,092
Ending balance | 15,699 |  |
Ending balance: Individually evaluated for impairment | 28 | 17 |
Ending balance: Collectively evaluated for impairment | 15,671 | 10,806 |
Construction Loans | Commercial Real Estate Portfolio Segment [Member] |  |  |
Allowance for loan losses: |  |  |
Beginning Balance | 969 | 923 |
Charge-offs |  | (16) |
Recoveries |  | 3 |
Recoveries, net | (1) |  |
Provision (release) | (168) | 201 |
Ending Balance | 800 | 1,143 |
Ending balance: Collectively evaluated for impairment | 800 | 1,143 |
Loans: |  |  |
Ending balance |  | 91,479 |
Ending balance | 95,497 |  |
Ending balance: Individually evaluated for impairment | 103 | 197 |
Ending balance: Collectively evaluated for impairment | 94,684 | $ 91,282 |
Ending balance: Acquired and accounted for ASC 310-30 | $ 710 |  |

X
- Definition Amount of recovery of loans and lease receivable, net of adjustments. + References No definition available. + Details
Name: | osbc_AllowanceForLoanAndLeaseLossRecoveryOfBadDebtsNetOfAdjustments
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 and purchased credit impaired loans. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
Name: | osbc_LoansAndLeasesReceivableIncludingPurchasedCreditImpairedLoansNetOfDeferredIncome
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
Name: | us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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
- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
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: |

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