Loans and Allowance for Credit Losses on Loans - Schedule of Activity in Allowance for Credit Losses on Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Analysis of allowance for loan losses
Beginning balance	$ 26,286	$ 22,760	$ 24,796	$ 21,993	$ 21,993
Provision for (reversal of) credit losses	1,206	234	3,148	1,054
Charge-offs	(195)	(42)	(867)	(110)	(137)
Recoveries	2	8	222	23
Ending balance	27,299	22,960	27,299	22,960	24,796
CRE
Analysis of allowance for loan losses
Beginning balance	8,970	7,926	9,290	7,915	7,915
Provision for (reversal of) credit losses	736	1,481	465	1,492
Charge-offs	0	0	(129)	0	0
Recoveries	0	0	80	0
Ending balance	9,706	9,407	9,706	9,407	9,290
SBA—real estate
Analysis of allowance for loan losses
Beginning balance	5,899	2,927	5,557	1,657	1,657
Provision for (reversal of) credit losses	(13)	173	742	1,509
Charge-offs	0	0	(413)	(66)	(66)
Recoveries	0	0	0	0
Ending balance	5,886	3,100	5,886	3,100	5,557
SBA—non-real estate
Analysis of allowance for loan losses
Beginning balance	499	253	418	147	147
Provision for (reversal of) credit losses	31	58	103	149
Charge-offs	(26)	(11)	(36)	(11)	(27)
Recoveries	1	6	20	21
Ending balance	505	306	505	306	418
C&I
Analysis of allowance for loan losses
Beginning balance	1,459	2,151	1,844	1,215	1,215
Provision for (reversal of) credit losses	227	8	(250)	944
Charge-offs	(169)	(31)	(198)	(31)	(44)
Recoveries	1	0	122	0
Ending balance	1,518	2,128	1,518	2,128	1,844
Home mortgage
Analysis of allowance for loan losses
Beginning balance	9,459	9,499	7,684	11,045	11,045
Provision for (reversal of) credit losses	225	(1,482)	2,091	(3,026)
Charge-offs	0	0	(91)	(2)	0
Recoveries	0	2	0	2
Ending balance	9,684	8,019	9,684	8,019	7,684
Consumer and Other
Analysis of allowance for loan losses
Beginning balance	0	4	3	14	14
Provision for (reversal of) credit losses	0	(4)	(3)	(14)
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Ending balance	$ 0	$ 0	$ 0	$ 0	$ 3

OP Bancorp 10-Q