XML 62 R51.htm IDEA: XBRL DOCUMENT v3.24.2.u1

Loans and Allowance for Credit Losses on Loans - Schedule of Credit Risk Ratings by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]
Current Year	$ 161,164		$ 161,164		$ 221,745
Year One	228,564		228,564		582,171
Year Two	627,758		627,758		284,271
Year Three	313,412		313,412		145,890
Year Four	140,258		140,258		178,838
Prior	247,737		247,737		272,711
Revolving Loans	148,809		148,809		77,658
Revolving Loans Converted to Term Loans	2,404		2,404		2,561
Total	1,870,106		1,870,106		1,765,845
Current period charge-offs
Current Year			0		17
Year One			0		457
Year Two			0		247
Year Three			66		0
Year Four			0		91
Prior			2		52
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total	$ 0	$ 20	$ 68	$ 136	$ 864
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable		Accrued interest receivable		Accrued interest receivable
Accrued interest receivable	$ 7,500		$ 7,500		$ 7,300
Pass
Financing Receivable Recorded Investment [Line Items]
Current Year	161,164		161,164		221,745
Year One	228,434		228,434		577,233
Year Two	616,841		616,841		282,943
Year Three	310,423		310,423		144,754
Year Four	139,070		139,070		178,838
Prior	243,059		243,059		264,767
Revolving Loans	148,809		148,809		77,658
Revolving Loans Converted to Term Loans	2,404		2,404		2,561
Total	1,850,204		1,850,204		1,750,499
Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	130		130		0
Year Two	2,143		2,143		0
Year Three	0		0		0
Year Four	0		0		0
Prior	1,066		1,066		1,428
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	3,339		3,339		1,428
Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		4,938
Year Two	8,774		8,774		1,328
Year Three	2,989		2,989		1,136
Year Four	1,188		1,188		0
Prior	3,514		3,514		6,418
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	16,465		16,465		13,820
Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	98		98		98
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	98		98		98
Commercial real estate
Financing Receivable Recorded Investment [Line Items]
Current Year	116,680		116,680		97,114
Year One	109,665		109,665		208,179
Year Two	266,048		266,048		154,872
Year Three	191,416		191,416		97,137
Year Four	98,294		98,294		138,908
Prior	124,050		124,050		168,316
Revolving Loans	25,131		25,131		21,059
Revolving Loans Converted to Term Loans	0		0		0
Total	931,284		931,284		885,585
Current period charge-offs
Current Year			0		0
Year One			0		457
Year Two			0		121
Year Three			0		0
Year Four			0		91
Prior			0		17
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total	0	0	0	91	686
Commercial real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year	116,680		116,680		97,114
Year One	109,665		109,665		207,860
Year Two	260,820		260,820		154,872
Year Three	191,416		191,416		97,137
Year Four	98,294		98,294		138,908
Prior	123,063		123,063		163,320
Revolving Loans	25,131		25,131		21,059
Revolving Loans Converted to Term Loans	0		0		0
Total	925,069		925,069		880,270
Commercial real estate | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	582		582		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	582		582		0
Commercial real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		319
Year Two	4,646		4,646		0
Year Three	0		0		0
Year Four	0		0		0
Prior	987		987		4,996
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	5,633		5,633		5,315
Commercial real estate | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
SBA—real estate
Financing Receivable Recorded Investment [Line Items]
Current Year	14,850		14,850		31,920
Year One	31,583		31,583		46,291
Year Two	47,745		47,745		27,267
Year Three	27,911		27,911		23,868
Year Four	18,703		18,703		28,244
Prior	82,962		82,962		67,105
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	223,754		223,754		224,695
Current period charge-offs
Current Year			0		0
Year One			0		0
Year Two			0		46
Year Three			66		0
Year Four			0		0
Prior			0		0
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total	0	0	66	11	46
SBA—real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year	14,850		14,850		31,920
Year One	31,583		31,583		44,504
Year Two	43,005		43,005		26,188
Year Three	24,922		24,922		22,732
Year Four	17,561		17,561		28,244
Prior	79,663		79,663		64,442
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	211,584		211,584		218,030
SBA—real estate | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	1,561		1,561		0
Year Three	0		0		0
Year Four	0		0		0
Prior	1,066		1,066		1,428
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	2,627		2,627		1,428
SBA—real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		1,787
Year Two	3,179		3,179		1,079
Year Three	2,989		2,989		1,136
Year Four	1,142		1,142		0
Prior	2,233		2,233		1,235
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	9,543		9,543		5,237
SBA—real estate | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
SBA—non-real estate
Financing Receivable Recorded Investment [Line Items]
Current Year	5,748		5,748		5,408
Year One	4,815		4,815		3,175
Year Two	2,987		2,987		200
Year Three	181		181		1,556
Year Four	1,434		1,434		950
Prior	3,476		3,476		3,708
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	18,641		18,641		14,997
Current period charge-offs
Current Year			0		0
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Prior			0		35
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total	0	20	0	34	35
SBA—non-real estate | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year	5,748		5,748		5,408
Year One	4,815		4,815		2,584
Year Two	2,459		2,459		200
Year Three	181		181		1,556
Year Four	1,388		1,388		950
Prior	3,295		3,295		3,423
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	17,886		17,886		14,121
SBA—non-real estate | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
SBA—non-real estate | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		591
Year Two	528		528		0
Year Three	0		0		0
Year Four	46		46		0
Prior	83		83		187
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	657		657		778
SBA—non-real estate | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	98		98		98
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	98		98		98
C&I
Financing Receivable Recorded Investment [Line Items]
Current Year	8,152		8,152		15,117
Year One	14,591		14,591		17,939
Year Two	17,125		17,125		22,098
Year Three	19,189		19,189		4,695
Year Four	3,886		3,886		1,720
Prior	525		525		1,734
Revolving Loans	122,685		122,685		55,106
Revolving Loans Converted to Term Loans	2,404		2,404		2,561
Total	188,557		188,557		120,970
Current period charge-offs
Current Year			0		17
Year One			0		0
Year Two			0		80
Year Three			0		0
Year Four			0		0
Prior			0		0
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total	0	0	0	0	97
C&I | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year	8,152		8,152		15,117
Year One	14,461		14,461		17,939
Year Two	16,704		16,704		22,098
Year Three	19,189		19,189		4,695
Year Four	3,886		3,886		1,720
Prior	525		525		1,734
Revolving Loans	122,685		122,685		55,106
Revolving Loans Converted to Term Loans	2,404		2,404		2,561
Total	188,006		188,006		120,970
C&I | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	130		130		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	130		130		0
C&I | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	421		421		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	421		421		0
C&I | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Home mortgage
Financing Receivable Recorded Investment [Line Items]
Current Year	15,730		15,730		72,182
Year One	67,910		67,910		306,587
Year Two	293,853		293,853		79,834
Year Three	74,715		74,715		18,634
Year Four	17,941		17,941		8,939
Prior	36,724		36,724		31,848
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	506,873		506,873		518,024
Current period charge-offs
Current Year			0		0
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Prior			2		0
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total	0	0	2	0	0
Home mortgage | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year	15,730		15,730		72,182
Year One	67,910		67,910		304,346
Year Two	293,853		293,853		79,585
Year Three	74,715		74,715		18,634
Year Four	17,941		17,941		8,939
Prior	36,513		36,513		31,848
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	506,662		506,662		515,534
Home mortgage | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Home mortgage | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		2,241
Year Two	0		0		249
Year Three	0		0		0
Year Four	0		0		0
Prior	211		211		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	211		211		2,490
Home mortgage | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Consumer
Financing Receivable Recorded Investment [Line Items]
Current Year	4		4		4
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		77
Prior	0		0		0
Revolving Loans	993		993		1,493
Revolving Loans Converted to Term Loans	0		0		0
Total	997		997		1,574
Current period charge-offs
Current Year			0		0
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Prior			0		0
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total	0	$ 0	0	$ 0	0
Consumer | Pass
Financing Receivable Recorded Investment [Line Items]
Current Year	4		4		4
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		77
Prior	0		0		0
Revolving Loans	993		993		1,493
Revolving Loans Converted to Term Loans	0		0		0
Total	997		997		1,574
Consumer | Special mention
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Consumer | Substandard
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Consumer | Doubtful
Financing Receivable Recorded Investment [Line Items]
Current Year	0		0		0
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		0
Year Four	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	$ 0		$ 0		$ 0

X

- Definition

Financing Receivable Excluding Accrued Interests Credit Loss Impact of CECL Adoption

+ References

No definition available.

+ Details

Name:	opbk_FinancingReceivableExcludingAccruedInterestsCreditLossImpactOfCECLAdoption
Namespace Prefix:	opbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3A

+ Details

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

X

- Definition

Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3A

+ Details

Name:	us-gaap_FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

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

Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A

Reference 3: 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

+ Details

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

X

- Definition

Amount, excluding accrued interest, of writeoff of revolving financing receivable converted to term loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6A

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 29
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-29

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

+ Details

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

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=opbk_SBARealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=opbk_SBANonRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=opbk_CommercialAndIndustrialPortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=opbk_HomeMortgagePortfolioMember
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: