XML 132 R113.htm IDEA: XBRL DOCUMENT v3.22.0.1

Commitments and Contingencies - Narrative (Details)	Dec. 31, 2021 USD ($) letter_of_credit	Dec. 31, 2020 USD ($) letter_of_credit
Lending-related Commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Reserve for lending related commitments	$ 2,300,000	$ 2,300,000
Letter of credit | FHLB
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of instruments | letter_of_credit	43	35
Maximum borrowing capacity	$ 599,300,000	$ 527,400,000

X

- Definition

Line Of Credit Facility, Number Of Instruments

+ References

No definition available.

+ Details

Name:	obnk_LineOfCreditFacilityNumberOfInstruments
Namespace Prefix:	obnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Reserve for Lending Related Commitments

+ References

No definition available.

+ Details

Name:	obnk_ReserveforLendingRelatedCommitments
Namespace Prefix:	obnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=obnk_FederalHomeLoanBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: