XML 85 R66.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance | $ 86,670 | $ 37,520 | $ 34,203
Impact of Adopting ASC 326 | 64,586 | 86,670 | 37,520
Charge-offs | 12,234 | 12,394 | 10,131
Recoveries | 948 | 1,268 | 4,241
Provision | (10,798) | 59,028 | 9,207
Ending Balance | 64,586 | 86,670 | 37,520
Average Balance | $ 5,343,976 | $ 4,950,545 | $ 3,972,861
Net Charge-offs to Loan Average Balance | 0.21% | 0.22% | 0.15%
Provision (benefit) for credit losses | $ (10,800) | $ 59,900 | $ 9,600
Provision (release) for off-balance sheet commitments | 68 | 902 | 361
Credit loss expense (benefit) | 101 | 30 |
Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance |  | 1,248 |
Impact of Adopting ASC 326 |  |  | 1,248
Ending Balance |  |  | 1,248
Real estate | Commercial real estate |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance | 15,430 | 10,013 | 8,999
Impact of Adopting ASC 326 | 13,425 | 15,430 | 10,013
Charge-offs | 170 | 4,924 | 1,420
Recoveries | 65 | 19 | 341
Provision | (1,900) | 15,374 | 2,093
Ending Balance | 13,425 | 15,430 | 10,013
Average Balance | $ 1,501,890 | $ 1,322,477 | $ 1,247,941
Net Charge-offs to Loan Average Balance | 0.01% | 0.37% | 0.09%
Real estate | Commercial real estate | Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance |  | $ (5,052) |
Impact of Adopting ASC 326 |  |  | $ (5,052)
Ending Balance |  |  | (5,052)
Real estate | Construction/land/land development |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance | $ 8,191 | 3,711 | 3,331
Impact of Adopting ASC 326 | 4,011 | 8,191 | 3,711
Charge-offs | 0 | 0 | 38
Recoveries | 0 | 1 | 40
Provision | (4,180) | 3,338 | 378
Ending Balance | 4,011 | 8,191 | 3,711
Average Balance | $ 528,618 | $ 554,038 | $ 505,795
Net Charge-offs to Loan Average Balance | 0.00% | 0.00% | 0.00%
Real estate | Construction/land/land development | Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance |  | $ 1,141 |
Impact of Adopting ASC 326 |  |  | $ 1,141
Ending Balance |  |  | 1,141
Real estate | Residential real estate |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance | $ 9,418 | 6,332 | 5,705
Impact of Adopting ASC 326 | 6,116 | 9,418 | 6,332
Charge-offs | 78 | 692 | 265
Recoveries | 117 | 202 | 185
Provision | (3,341) | 6,102 | 707
Ending Balance | 6,116 | 9,418 | 6,332
Average Balance | $ 916,039 | $ 769,838 | $ 661,581
Net Charge-offs to Loan Average Balance | 0.00% | 0.06% | 0.01%
Real estate | Residential real estate | Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance |  | $ (2,526) |
Impact of Adopting ASC 326 |  |  | $ (2,526)
Ending Balance |  |  | (2,526)
Commercial and industrial |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance | $ 51,857 | 16,960 | 15,616
Impact of Adopting ASC 326 | 40,146 | 51,857 | 16,960
Charge-offs | 11,923 | 6,702 | 8,231
Recoveries | 717 | 1,022 | 3,627
Provision | (505) | 33,281 | 5,948
Ending Balance | 40,146 | 51,857 | 16,960
Average Balance | $ 1,627,077 | $ 1,710,648 | $ 1,324,002
Net Charge-offs to Loan Average Balance | 0.69% | 0.33% | 0.35%
Commercial and industrial | Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance |  | $ 7,296 |
Impact of Adopting ASC 326 |  |  | $ 7,296
Ending Balance |  |  | 7,296
Mortgage warehouse lines of credit |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance | $ 856 | 262 | 316
Impact of Adopting ASC 326 | 340 | 856 | 262
Charge-offs | 0 | 0 | 29
Recoveries | 0 | 0 | 0
Provision | (516) | 565 | (25)
Ending Balance | 340 | 856 | 262
Average Balance | $ 753,588 | $ 574,837 | $ 212,733
Net Charge-offs to Loan Average Balance | 0.00% | 0.00% | 0.01%
Mortgage warehouse lines of credit | Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance |  | $ 29 |
Impact of Adopting ASC 326 |  |  | $ 29
Ending Balance |  |  | 29
Consumer |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance | $ 918 | 242 | 236
Impact of Adopting ASC 326 | 548 | 918 | 242
Charge-offs | 63 | 76 | 148
Recoveries | 49 | 24 | 48
Provision | (356) | 368 | 106
Ending Balance | 548 | 918 | 242
Average Balance | $ 16,764 | $ 18,707 | $ 20,809
Net Charge-offs to Loan Average Balance | 0.08% | 0.28% | 0.48%
Consumer | Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning Balance |  | $ 360 |
Impact of Adopting ASC 326 |  |  | $ 360
Ending Balance |  |  | $ 360

X
- Definition Credit Loss, Expense (Reversal) + References No definition available. + Details
Name: | obnk_CreditLossExpenseReversal
Namespace Prefix: | obnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of writeoff after recovery to average financing receivables outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) + Details
Name: | srt_FinancingReceivableWriteoffAfterRecoveryToAverageOutstandingPercent
Namespace Prefix: | srt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss on investment in 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 (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + 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 (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Average amount outstanding, before allowance for credit loss, of financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) + Details
Name: | us-gaap_FinancingReceivablesBeforeAllowanceForCreditLossAverageAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. 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 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + 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 (b) -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 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
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: |