Subordinated Note	6 Months Ended
Jun. 30, 2026
Debt Disclosure [Abstract]
Subordinated Note	Subordinated Note On November 7, 2025, OP Bancorp issued in a private placement a $25.0 million principal amount of fixed-to-floating rate note due 2035 (the "2035 Note"). The 2035 Note will mature on November 15, 2035. From the original issue date to, but excluding, November 15, 2030, the 2035 Note will bear interest at a fixed rate of 7.50% per annum and payable semi-annually in arrears on May 15 and November 15 of each year, beginning May 15, 2026. Thereafter, until maturity or earlier redemption, the 2035 Note will bear interest at a floating rate, reset quarterly, equal to the three-month term Secured Overnight Financing Rate ("SOFR") plus 411 basis points and payable in arrears on February 15, May 15, August 15, and November 15 of each year. The Company may, at its option, redeem the 2035 Note, in whole or part, at any time after the fifth anniversary of issuance, subject to any required regulatory approvals. The 2035 Note is qualified as tier 2 capital under current regulatory guidelines and interpretations. Debt issuance costs incurred in connection with the issuance of the 2035 Note totaled $426 thousand and were capitalized in accordance with ASC 835-30. These costs are presented as a direct deduction from the carrying amount of the subordinated note on the Consolidated Balance Sheet and are amortized into interest expense over the contractual term of the note using the straight-line method. As of both June 30, 2026 and December 31, 2025, the balance of the 2035 Note, net of unamortized debt issuance cost was $24.6 million. The amortization of debt issuance cost was $22 thousand and $43 thousand for three and six months ended June 30, 2026, respectively.

On November 7, 2025, OP Bancorp issued in a private placement a $25.0 million principal amount of fixed-to-floating rate note due 2035 (the "2035 Note"). The 2035 Note will mature on November 15, 2035. From the original issue date to, but excluding, November 15, 2030, the 2035 Note will bear interest at a fixed rate of 7.50% per annum and payable semi-annually in arrears on May 15 and November 15 of each year, beginning May 15, 2026. Thereafter, until maturity or earlier redemption, the 2035 Note will bear interest at a floating rate, reset quarterly, equal to the three-month term Secured Overnight Financing Rate ("SOFR") plus 411 basis points and payable in arrears on February 15, May 15, August 15, and November 15 of each year. The Company may, at its option, redeem the 2035 Note, in whole or part, at any time after the fifth anniversary of issuance, subject to any required regulatory approvals. The 2035 Note is qualified as tier 2 capital under current regulatory guidelines and interpretations. Debt issuance costs incurred in connection with the issuance of the 2035 Note totaled $426 thousand and were capitalized in accordance with ASC 835-30. These costs are presented as a direct deduction from the carrying amount of the subordinated note on the Consolidated Balance Sheet and are amortized into interest expense over the contractual term of the note using the straight-line method. As of both June 30, 2026 and December 31, 2025, the balance of the 2035 Note, net of unamortized