XML 48 R32.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Acquisition (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Acquisition |
Summary of acquisition | ​
​ | ​ | ​ | ​
West Suburban Acquisition Summary
As of Date of Acquisition
​ | ​ | ​ | ​
​ | ​ | December 1, 2021
Assets | ​ | ​ | ​
Cash and due from banks | ​ | $ | 16,794
Interest bearing deposits with financial institutions | ​ | ​ | 232,880
Securities available-for-sale and held-to maturity, at fair value | ​ | ​ | 1,067,517
FHLBC stock | ​ | ​ | 3,340
Loans, net of allowance for credit losses Day One PCD loan adjustment | ​ | ​ | 1,500,974
Premises and equipment | ​ | ​ | 47,456
Other real estate owned | ​ | ​ | 5,552
Core deposit intangible | ​ | ​ | 14,772
Deferred tax assets | ​ | ​ | 5,819
Other assets | ​ | ​ | 48,838
Total assets | ​ | $ | 2,943,942
​ | ​ | ​ | ​
Liabilities | ​ | ​ | ​
Noninterest bearing demand | ​ | $ | 1,070,980
Savings, NOW and money market | ​ | ​ | 1,408,051
Time | ​ | ​ | 215,205
Total deposits | ​ | ​ | 2,694,236
Reserve for unfunded commitments | ​ | ​ | 1,787
Other liabilities | ​ | ​ | 20,629
Total liabilities | ​ | ​ | 2,716,652
​ | ​ | ​ | ​
Cash consideration paid | ​ | ​ | 100,679
Stock issued for acquisition | ​ | ​ | 194,484
Total Liabilities Assumed and Cash and Stock Consideration Paid for Acquisition | ​ | $ | 3,011,815
Goodwill | ​ | $ | 67,873
Schedule of Purchase price of loans at acquisition | ​
​ | ​ | ​ | ​
​ | ​ | As of
West Suburban Acquired PCD Loans | ​ | December 1, 2021
Par value of acquired loans | ​ | $ | 108,241
Allowance for credit losses | ​ | ​ | (12,075)
Non-credit discount | ​ | ​ | (1,723)
Purchase price of PCD loans at acquisition | ​ | $ | 94,443
Schedule of Unaudited Pro Forma | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Unaudited Pro Forma for the Years Ended
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2021 | ​ | 2020
Net interest income | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 166,495 | ​ | $ | 165,283
Noninterest income | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 59,036 | ​ | ​ | 48,937
Net income attributable to Old Second Bancorp, Inc. | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 67,779 | ​ | ​ | 12,349
​
Schedule of carrying amount of acquired loans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Acquired Loan Detail | ​ | As of December 31, 2023 | ​ | ​ | As of December 31, 2022
​ | ​ | PCD | ​ | Non-PCD | ​ | Total | ​ | ​ | PCD | ​ | Non-PCD | ​ | Total
West Suburban acquired loans | ​ | $ | 54,123 | ​ | $ | 822,078 | ​ | $ | 876,201 | ​ | ​ | $ | 75,396 | ​ | $ | 1,059,363 | ​ | $ | 1,134,759
ABC Bank acquired loans | ​ | ​ | 1,602 | ​ | ​ | 21,556 | ​ | ​ | 23,158 | ​ | ​ | ​ | 1,786 | ​ | ​ | 31,895 | ​ | ​ | 33,681
Talmer Bank acquired loans | ​ | ​ | - | ​ | ​ | 12,193 | ​ | ​ | 12,193 | ​ | ​ | ​ | - | ​ | ​ | 15,693 | ​ | ​ | 15,693
Total acquired loans net book value | ​ | $ | 55,725 | ​ | $ | 855,827 | ​ | $ | 911,552 | ​ | ​ | $ | 77,182 | ​ | $ | 1,106,951 | ​ | $ | 1,184,133
Accretion recorded on acquired loans year to date | ​ | $ | 668 | ​ | $ | 1,684 | ​ | $ | 2,352 | ​ | ​ | $ | 848 | ​ | $ | 4,726 | ​ | $ | 5,574
Accretion recorded on acquired unfunded commitments year to date | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 819 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 893

X
- Definition Tabular disclosure of carrying value of loans acquired in transfer not accounted for as debt securities acquired during period. + References No definition available. + Details
Name: | osbc_ScheduleOfCarryingValueOfLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodTableTextBlock
Namespace Prefix: | osbc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References No definition available. + Details
Name: | osbc_ScheduleOfFinancingReceivablesAcquiredNotAccountedForAsDebtSecuritiesTableTextBlock
Namespace Prefix: | osbc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(2) -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479328/805-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(3) -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479328/805-10-50-2 + Details
Name: | us-gaap_BusinessAcquisitionProFormaInformationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
Name: | us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration