XML 72 R53.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Significant Accounting Policies - Cumulative Effect Adjustment to Retained Earnings (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | $ 37,520
Reserve for off-balance sheet exposures |  | 1,810
Municipal securities |  | 0
Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | $ 1,248 |
Reserve for off-balance sheet exposures | (381) |
Municipal securities | 96 |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 38,768 |
Reserve for off-balance sheet exposures | 1,429 |
Municipal securities | 96 |
Real estate |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | 20,056
Real estate | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | (6,437) |
Real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 13,619 |
Real estate | Commercial real estate |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | 10,013
Real estate | Commercial real estate | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | (5,052) |
Real estate | Commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 4,961 |
Real estate | Construction/land/land development |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | 3,711
Real estate | Construction/land/land development | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 1,141 |
Real estate | Construction/land/land development | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 4,852 |
Real estate | Residential real estate |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | 6,332
Real estate | Residential real estate | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | (2,526) |
Real estate | Residential real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 3,806 |
Commercial and industrial |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | 16,960
Commercial and industrial | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 7,296 |
Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 24,256 |
Mortgage warehouse lines of credit |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | 262
Mortgage warehouse lines of credit | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 29 |
Mortgage warehouse lines of credit | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 291 |
Consumer |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses |  | $ 242
Consumer | Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | 360 |
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Allowance for loan losses | $ 602 |

X
- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember
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_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: |

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: |