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Mortgage Banking - Mortgage Banking Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Mortgage Banking [Abstract]
Origination	$ 151	$ 124	$ 421	$ 384
Gain on sale of loans held for sale	1,535	757	3,836	2,380
Originations of MSRs	0	225	0	656
Servicing	3	915	738	2,840
Total gross mortgage revenue	1,689	2,021	4,995	6,260
MSR valuation adjustments, net	0	(122)	450	(485)
Gain on sale of MSR	0	0	410	0
Mortgage HFS and pipeline fair value adjustment	(536)	(110)	53	(27)
MSR hedge impact	0	(897)	(479)	(1,673)
Mortgage banking revenue	$ 1,153	$ 892	$ 5,429	$ 4,075

X

- Definition

Gain (Loss) on Sale of Mortgage Servicing Rights

+ References

No definition available.

+ Details

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X

- Definition

Gross Mortgage Revenue

+ References

No definition available.

+ Details

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X

- Definition

Noninterest income derived from the sale and changes in fair value of residential mortgage loans held for sale and fees for servicing of residential mortgage loans held by third parties. Also includes changes in the fair value of residential mortgage loan commitments and forward sales commitments considered to be derivative instruments.

+ References

No definition available.

+ Details

Name:	obnk_MortgageBankingRevenue
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Balance Type:	credit
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X

- Definition

Mortgage Banking Revenue, Origination

+ References

No definition available.

+ Details

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- Definition

Mortgage Banking Revenue, Originations Of Mortgage Servicing Rights

+ References

No definition available.

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X

- Definition

Mortgage Servicing Right Hedge Impact

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Mortgage Servicing Right and Hedge Fair Value Adjustment

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Mortgage Servicing Rights, Valuation Adjustment, Net of Amortization

+ References

No definition available.

+ Details

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- Definition

Servicing Fees, Net1

+ References

No definition available.

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X

- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-SubTopic 310
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-SubTopic 310
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477409/944-310-45-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 310
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477363/944-310-50-1

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- References

No definition available.

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