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Investment Securities - Amortized Cost and Fair Value - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities Available-for-Sale |  |
Amortized cost, available for sale | $ 156,426 | $ 185,690
Gross unrealized (losses) | (11,777) | (15,697)
Available-for-sale, fair value | 144,649 | 169,993
Past Due |  |
Securities Available-for-Sale |  |
Available-for-sale, fair value | 0 | 0
U.S. Treasuries |  |
Securities Available-for-Sale |  |
Amortized cost, available for sale | 30,892 | 44,793
Gross unrealized (losses) | (888) | (1,816)
Available-for-sale, fair value | 30,004 | 42,977
U.S. government and federal agencies |  |
Securities Available-for-Sale |  |
Amortized cost, available for sale | 13,939 | 13,850
Gross unrealized (losses) | (318) | (575)
Available-for-sale, fair value | 13,621 | 13,275
Corporate bonds |  |
Securities Available-for-Sale |  |
Amortized cost, available for sale | 3,000 | 3,000
Gross unrealized (losses) | (345) | (477)
Available-for-sale, fair value | 2,655 | 2,523
U.S. agency collateralized mortgage obligations |  |
Securities Available-for-Sale |  |
Amortized cost, available for sale | 38,508 | 40,806
Gross unrealized (losses) | (5,602) | (6,496)
Available-for-sale, fair value | 32,906 | 34,310
Tax-exempt municipal |  |
Securities Available-for-Sale |  |
Amortized cost, available for sale | 1,379 | 1,380
Gross unrealized (losses) | (158) | (149)
Available-for-sale, fair value | 1,221 | 1,231
Taxable municipal |  |
Securities Available-for-Sale |  |
Amortized cost, available for sale | 270 | 606
Gross unrealized (losses) | (9) | (19)
Available-for-sale, fair value | 261 | 587
U.S. agency mortgage-backed |  |
Securities Available-for-Sale |  |
Amortized cost, available for sale | 68,438 | 81,255
Gross unrealized (losses) | (4,457) | (6,165)
Available-for-sale, fair value | $ 63,981 | $ 75,090

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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