XML 83 R66.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Loans - Loan Portfolio Aging Analysis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 7,573,713 | $ 7,660,944
Accruing Loans 90 or More Days Past Due | 0 | 0
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 42,437 | 26,043
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 20,744 | 12,574
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 8,484 | 2,076
Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 13,209 | 11,393
Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 7,531,276 | 7,634,901
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,199,031 | 5,247,894
Accruing Loans 90 or More Days Past Due | 0 | 0
Residential real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 34,499 | 18,479
Residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 16,672 | 11,153
Residential real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 6,271 | 1,353
Residential real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 11,556 | 5,973
Residential real estate | Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,164,532 | 5,229,415
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,002,634 | 2,059,460
Accruing Loans 90 or More Days Past Due | 0 | 0
Commercial and industrial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 7,675 | 7,351
Commercial and industrial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 3,873 | 1,221
Commercial and industrial | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,206 | 713
Commercial and industrial | Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,596 | 5,417
Commercial and industrial | Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,994,959 | 2,052,109
Mortgage warehouse lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 349,081 | 329,966
Accruing Loans 90 or More Days Past Due | 0 | 0
Mortgage warehouse lines of credit | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 0 | 0
Mortgage warehouse lines of credit | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 0 | 0
Mortgage warehouse lines of credit | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 0 | 0
Mortgage warehouse lines of credit | Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 0 | 0
Mortgage warehouse lines of credit | Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 349,081 | 329,966
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 22,967 | 23,624
Accruing Loans 90 or More Days Past Due | 0 | 0
Consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 263 | 213
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 199 | 200
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 7 | 10
Consumer | Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 57 | 3
Consumer | Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 22,704 | 23,411
Commercial real estate | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,477,431 | 2,442,734
Accruing Loans 90 or More Days Past Due | 0 | 0
Commercial real estate | Residential real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,552 | 2,264
Commercial real estate | Residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 3,576 | 2,264
Commercial real estate | Residential real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,019 | 0
Commercial real estate | Residential real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 957 | 0
Commercial real estate | Residential real estate | Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 2,471,879 | 2,440,470
Construction/land/land development | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 864,011 | 1,070,225
Accruing Loans 90 or More Days Past Due | 0 | 0
Construction/land/land development | Residential real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,350 | 874
Construction/land/land development | Residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 441 | 834
Construction/land/land development | Residential real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 33 | 27
Construction/land/land development | Residential real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 4,876 | 13
Construction/land/land development | Residential real estate | Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 858,661 | 1,069,351
Residential real estate | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 1,857,589 | 1,734,935
Accruing Loans 90 or More Days Past Due | 0 | 0
Residential real estate | Residential real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 23,597 | 15,341
Residential real estate | Residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 12,655 | 8,055
Residential real estate | Residential real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,219 | 1,326
Residential real estate | Residential real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | 5,723 | 5,960
Residential real estate | Residential real estate | Current Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Loans Receivable | $ 1,833,992 | $ 1,719,594

X
- Definition Amortized cost excluding accrued interest, of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=obnk_RealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=obnk_MortgageWarehousePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=obnk_ConstructionLandandLandDevelopmentLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |