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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2026
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost and Fair Values of Investments in Debt Securities | The following tables summarize the amortized cost, fair value, and allowance for credit losses and the corresponding amounts of gross unrealized gains and losses of available-for-sale securities recognized in accumulated other comprehensive income (loss) and gross unrecognized gains and losses of held-to-maturity securities:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Allowance for Credit Losses
| (dollars in thousands; unaudited) |  |
June 30, 2026 |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |
U.S. Agency collateralized mortgage obligations | $ | 28 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 27 |  |  | $ | — |
Total available-for-sale securities | 28 |  |  | — |  |  | (1) |  |  | 27 |  |  | — |
Held-to-maturity |  |  |  |  |  |  |  |  |
U.S. Agency residential mortgage-backed securities | 45,218 |  |  | 518 |  |  | (403) |  |  | 45,333 |  |  | — |
Total investment securities | $ | 45,246 |  |  | $ | 518 |  |  | $ | (404) |  |  | $ | 45,360 |  |  | $ | — |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Allowance for Credit Losses
| (dollars in thousands; unaudited)
December 31, 2025 |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |
U.S. Agency collateralized mortgage obligations | $ | 30 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 29 |  |  | $ | — |
Total available-for-sale securities | 30 |  |  | — |  |  | (1) |  |  | 29 |  |  | — |
Held-to-maturity |  |  |  |  |  |  |  |  |
U.S. Agency residential mortgage-backed securities | 48,218 |  |  | 710 |  |  | (214) |  |  | 48,713 |  |  | — |
Total investment securities | $ | 48,248 |  |  | $ | 710 |  |  | $ | (215) |  |  | $ | 48,742 |  |  | $ | — |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity |
| Available-for-Sale |  | Held-to-Maturity
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
| (dollars in thousands; unaudited)
June 30, 2026 |  |  |  |  |  |  |
U.S. Agency residential mortgage-backed securities and collateralized mortgage obligations | 28 |  |  | 27 |  |  | 45,218 |  |  | 45,333 |
| $ | 28 |  |  | $ | 27 |  |  | $ | 45,218 |  |  | $ | 45,333 |
Summary of Investment Securities Continuous Unrealized Loss Position | The following tables show the investments’ gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for which an allowance for credit losses has not been recorded:
| Less Than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (dollars in thousands; unaudited)
June 30, 2026 |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |
U.S. Agency collateralized mortgage obligations | $ | — |  |  | $ | — |  |  | $ | 27 |  |  | $ | 1 |  |  | $ | 27 |  |  | $ | 1 |
Total available-for-sale securities | — |  |  | — |  |  | 27 |  |  | 1 |  |  | 27 |  |  | 1 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |
U.S. Agency residential mortgage-backed securities | 12,937 |  |  | 309 |  |  | 720 |  |  | 94 |  |  | 13,657 |  |  | 403 |
Total investment securities | $ | 12,937 |  |  | $ | 309 |  |  | $ | 747 |  |  | $ | 95 |  |  | $ | 13,684 |  |  | $ | 404 |
| Less Than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (dollars in thousands; unaudited)
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |
U.S. Agency collateralized mortgage obligations | $ | — |  |  | $ | — |  |  | $ | 29 |  |  | $ | 1 |  |  | $ | 29 |  |  | $ | 1 |
Total available-for-sale securities | — |  |  | — |  |  | 29 |  |  | 1 |  |  | 29 |  |  | 1 |
Held-to-maturity |  |  |  |  |  |  |  |  |  |  |
U.S. Agency residential mortgage-backed securities | 5,039 |  |  | 95 |  |  | 8,228 |  |  | 119 |  |  | 13,267 |  |  | 214 |
Total investment securities | $ | 5,039 |  |  | $ | 95 |  |  | $ | 8,257 |  |  | $ | 120 |  |  | $ | 13,296 |  |  | $ | 215 |

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5B + Details
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