XML 91 R80.htm IDEA: XBRL DOCUMENT v3.24.3

Commitments and Contingencies - Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Less than One Year	$ 931,611	$ 1,058,766
One-Three Years	702,534	1,011,148
Three-Five Years	341,012	382,875
Greater than Five Years	41,534	58,954
Off-balance sheet financial instrument	2,016,691	2,511,743
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Less than One Year	789,841	955,486
One-Three Years	634,711	990,690
Three-Five Years	329,739	349,918
Greater than Five Years	41,184	58,954
Off-balance sheet financial instrument	1,795,475	2,355,048
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Less than One Year	141,770	103,280
One-Three Years	67,823	20,458
Three-Five Years	11,273	32,957
Greater than Five Years	350	0
Off-balance sheet financial instrument	221,216	156,695
Unconditional cancellable commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instrument	$ 717,300	$ 759,400

X

- Definition

Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability, Greater Than Five Years

+ References

No definition available.

+ Details

Name:	obnk_FairValueDisclosureOffBalanceSheetRisksAmountLiabilityGreaterThanFiveYears
Namespace Prefix:	obnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability, Less Than One Year

+ References

No definition available.

+ Details

Name:	obnk_FairValueDisclosureOffBalanceSheetRisksAmountLiabilityLessThanOneYear
Namespace Prefix:	obnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability, One Year Through Three Years

+ References

No definition available.

+ Details

Name:	obnk_FairValueDisclosureOffBalanceSheetRisksAmountLiabilityOneYearThroughThreeYears
Namespace Prefix:	obnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability, Three Years Through Five Years

+ References

No definition available.

+ Details

Name:	obnk_FairValueDisclosureOffBalanceSheetRisksAmountLiabilityThreeYearsThroughFiveYears
Namespace Prefix:	obnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

+ Details

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Namespace Prefix:	us-gaap_
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

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=obnk_CommitmentsToExtendCreditUnconditionalCancellableCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: