XML 106 R89.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Mortgage Banking - Mortgage Banking Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Mortgage Banking [Abstract] |  |  |
Origination | $ 528 | $ 483 | $ 774
Gain on sale of loans held for sale | 4,928 | 3,111 | 4,889
Originations of MSR | 0 | 708 | 2,286
Servicing | 744 | 3,739 | 5,643
Total gross mortgage revenue | 6,200 | 8,041 | 13,592
MSR asset valuation adjustments, net | 450 | (4,089) | 1,219
Gain on sale of MSR asset | 410 | 0 | 0
Mortgage HFS and pipeline fair value adjustment | (1) | (53) | (1,352)
MSR asset hedge impact | (479) | (543) | (6,737)
Mortgage banking revenue | $ 6,580 | $ 3,356 | $ 6,722

X
- Definition Gain (Loss) on Sale of Mortgage Servicing Rights + References No definition available. + Details
Name: | obnk_GainLossOnSaleOfMortgageServicingRights
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gross Mortgage Revenue + References No definition available. + Details
Name: | obnk_GrossMortgageRevenue
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Banking Revenue, Origination + References No definition available. + Details
Name: | obnk_MortgageBankingRevenueOrigination
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Banking Revenue, Originations Of Mortgage Servicing Rights + References No definition available. + Details
Name: | obnk_MortgageBankingRevenueOriginationsOfMortgageServicingRights
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Servicing Right Hedge Impact + References No definition available. + Details
Name: | obnk_MortgageServicingRightHedgeImpact
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Servicing Right and Hedge Fair Value Adjustment + References No definition available. + Details
Name: | obnk_MortgageServicingRightandHedgeFairValueAdjustment
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Servicing Rights, Valuation Adjustment, Net of Amortization + References No definition available. + Details
Name: | obnk_MortgageServicingRightsValuationAdjustmentNetOfAmortization
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Servicing Fees, Net1 + References No definition available. + Details
Name: | obnk_ServicingFeesNet1
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 + Details
Name: | us-gaap_GainLossOnSaleOfMortgageLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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