XML 58 R48.htm IDEA: XBRL DOCUMENT v3.22.2

Loans - Recorded Investment in Loans and Allowance for Credit Losses by Loss Estimation Methodology (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 5,528,093		$ 5,231,331
Loans, allowance for credit losses	63,123	$ 62,173	64,586	$ 77,104	$ 85,136	$ 86,670
Probability of Default
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively evaluated, probability of default	5,511,181		5,204,478
Loan balance collectively evaluated	58,007		53,311
Fair Value of Collateral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	12,517		16,865
Loan balance individually evaluated	5,070		6,701
Discounted Cash Flow
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	4,395		9,988
Loan balance individually evaluated	46		4,574
Real estate | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,909,054		1,693,512
Loans, allowance for credit losses	16,112	14,606	13,425	16,282	18,397	15,430
Real estate | Commercial real estate | Probability of Default
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively evaluated, probability of default	1,907,141		1,691,269
Loan balance collectively evaluated	16,087		13,416
Real estate | Commercial real estate | Fair Value of Collateral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	0		166
Loan balance individually evaluated	0		0
Real estate | Commercial real estate | Discounted Cash Flow
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	1,913		2,077
Loan balance individually evaluated	25		9
Real estate | Construction/land/land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	635,556		530,083
Loans, allowance for credit losses	4,707	4,580	4,011	5,602	7,389	8,191
Real estate | Construction/land/land development | Probability of Default
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively evaluated, probability of default	634,432		529,789
Loan balance collectively evaluated	4,689		3,997
Real estate | Construction/land/land development | Fair Value of Collateral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	212		0
Loan balance individually evaluated	0		0
Real estate | Construction/land/land development | Discounted Cash Flow
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	912		294
Loan balance individually evaluated	18		14
Real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,005,623		909,739
Loans, allowance for credit losses	5,851	5,821	6,116	9,059	8,294	9,418
Real estate | Residential real estate | Probability of Default
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively evaluated, probability of default	998,586		898,456
Loan balance collectively evaluated	5,667		5,017
Real estate | Residential real estate | Fair Value of Collateral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	6,482		8,150
Loan balance individually evaluated	184		19
Real estate | Residential real estate | Discounted Cash Flow
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	555		3,133
Loan balance individually evaluated	0		1,080
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	1,430,239		1,454,235
Loans, allowance for credit losses	35,477	36,315	40,146	45,049	49,342	51,857
Commercial and industrial | Probability of Default
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively evaluated, probability of default	1,423,402		1,441,204
Loan balance collectively evaluated	30,589		29,995
Commercial and industrial | Fair Value of Collateral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	5,822		8,547
Loan balance individually evaluated	4,885		6,680
Commercial and industrial | Discounted Cash Flow
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	1,015		4,484
Loan balance individually evaluated	3		3,471
Mortgage warehouse lines of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	531,888		627,078
Loans, allowance for credit losses	459	329	340	560	923	856
Mortgage warehouse lines of credit | Probability of Default
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively evaluated, probability of default	531,888		627,078
Loan balance collectively evaluated	459		340
Mortgage warehouse lines of credit | Fair Value of Collateral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	0		0
Loan balance individually evaluated	0		0
Mortgage warehouse lines of credit | Discounted Cash Flow
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	0		0
Loan balance individually evaluated	0		0
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	15,733		16,684
Loans, allowance for credit losses	517	$ 522	548	$ 552	$ 791	$ 918
Consumer | Probability of Default
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively evaluated, probability of default	15,732		16,682
Loan balance collectively evaluated	516		546
Consumer | Fair Value of Collateral
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	1		2
Loan balance individually evaluated	1		2
Consumer | Discounted Cash Flow
Financing Receivable, Allowance for Credit Loss [Line Items]
Loan balance individually evaluated	0		0
Loan balance individually evaluated	$ 0		$ 0

X

- Definition

Financing Receivable Excluding Loans At Fair Value, Before Allowance for Credit Loss

+ References

No definition available.

+ Details

Name:	obnk_FinancingReceivableExcludingLoansAtFairValueBeforeAllowanceforCreditLoss
Namespace Prefix:	obnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ 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 https://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

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ 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 (g)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ 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 (g)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
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_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ 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 (h)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ 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 (h)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	obnk_CreditLossEstimationValuationMethodologyAxis=obnk_ValuationMethodologyProbabilityOfDefaultMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	obnk_CreditLossEstimationValuationMethodologyAxis=obnk_ValuationMethodologyFairValueOfCollateralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	obnk_CreditLossEstimationValuationMethodologyAxis=obnk_ValuationMethodologyDiscountedCashFlowMember
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: