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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | $ 83,289 | $ 94,071
Available-for-sale, gross unrealized gains | 1,855 | 540
Available-for-sale, gross unrealized losses | (151) | (595)
Investment securities available-for-sale, at fair value | 84,993 | 94,016
Held-to-maturity, amortized cost | 6,429 | 14,340
Held-to-maturity, gross unrealized gains | 130 | 22
Held-to-maturity, gross unrealized losses |  | (56)
Held-to-maturity, estimated fair value | 6,559 | 14,306
Corporate Note Securities |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 2,711 |
Available-for-sale, gross unrealized gains | 73 |
Investment securities available-for-sale, at fair value | 2,784 |
Residential Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 24,680 | 46,182
Available-for-sale, gross unrealized gains | 865 | 372
Available-for-sale, gross unrealized losses | (8) | (209)
Investment securities available-for-sale, at fair value | 25,537 | 46,345
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 40,849 | 43,686
Available-for-sale, gross unrealized gains | 780 | 73
Available-for-sale, gross unrealized losses | (142) | (386)
Investment securities available-for-sale, at fair value | 41,487 | 43,373
Held-to-maturity, amortized cost | 4,302 | 8,923
Held-to-maturity, gross unrealized gains | 75 | 2
Held-to-maturity, gross unrealized losses |  | (46)
Held-to-maturity, estimated fair value | 4,377 | 8,879
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 4,971 | 4,123
Available-for-sale, gross unrealized gains | 137 | 95
Investment securities available-for-sale, at fair value | 5,108 | 4,218
Held-to-maturity, amortized cost | 1,007 | 1,093
Held-to-maturity, gross unrealized gains | 21 | 15
Held-to-maturity, estimated fair value | 1,028 | 1,108
US Treasury Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 10,078 | 80
Available-for-sale, gross unrealized losses | (1) |
Investment securities available-for-sale, at fair value | 10,077 | 80
US Government Agencies Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Held-to-maturity, amortized cost | 1,120 | 4,324
Held-to-maturity, gross unrealized gains | 34 | 5
Held-to-maturity, gross unrealized losses |  | (10)
Held-to-maturity, estimated fair value | $ 1,154 | $ 4,319

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- Definition Amount, before tax, of unrealized gain 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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