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Investment Securities - Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | $ 68,542 | $ 83,289
Available-for-sale, gross unrealized gains | 1,653 | 1,855
Available-for-sale, gross unrealized losses | (91) | (151)
Investment securities available-for-sale, at fair value | 70,104 | 84,993
Held-to-maturity, amortized cost | 5,679 | 6,429
Held-to-maturity, gross unrealized gains | 116 | 130
Held-to-maturity, estimated fair value | 5,795 | 6,559
Corporate Note Securities |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 2,713 | 2,711
Available-for-sale, gross unrealized gains | 59 | 73
Investment securities available-for-sale, at fair value | 2,772 | 2,784
Residential Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 25,801 | 24,680
Available-for-sale, gross unrealized gains | 745 | 865
Available-for-sale, gross unrealized losses | (5) | (8)
Investment securities available-for-sale, at fair value | 26,541 | 25,537
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 36,217 | 40,849
Available-for-sale, gross unrealized gains | 723 | 780
Available-for-sale, gross unrealized losses | (85) | (142)
Investment securities available-for-sale, at fair value | 36,855 | 41,487
Held-to-maturity, amortized cost | 3,644 | 4,302
Held-to-maturity, gross unrealized gains | 79 | 75
Held-to-maturity, estimated fair value | 3,723 | 4,377
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 3,729 | 4,971
Available-for-sale, gross unrealized gains | 126 | 137
Investment securities available-for-sale, at fair value | 3,855 | 5,108
Held-to-maturity, amortized cost | 981 | 1,007
Held-to-maturity, gross unrealized gains | 16 | 21
Held-to-maturity, estimated fair value | 997 | 1,028
US Treasury Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, amortized cost | 82 | 10,078
Available-for-sale, gross unrealized losses | (1) | (1)
Investment securities available-for-sale, at fair value | 81 | 10,077
US Government Agencies Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Held-to-maturity, amortized cost | 1,054 | 1,120
Held-to-maturity, gross unrealized gains | 21 | 34
Held-to-maturity, estimated fair value | $ 1,075 | $ 1,154

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