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Investment Securities - Amortized Cost and Market Value of Securities Available for Sale (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Investment Securities |  |
Amortized Cost | $ 136,776,000 | $ 112,354,000
Gross Unrealized Gains | 1,339,000 | 2,031,000
Gross Unrealized Losses | (3,218,000) | (336,000)
Fair Value | 134,897,000 | 114,049,000
Trading securities | 0 | 0
Held to maturity | 0 | 0
Collateralized mortgage obligations |  |
Investment Securities |  |
Amortized Cost | 26,747,000 | 24,261,000
Gross Unrealized Gains | 349,000 | 396,000
Gross Unrealized Losses | (76,000) | (14,000)
Fair Value | 27,020,000 | 24,643,000
Agency mortgage-backed securities |  |
Investment Securities |  |
Amortized Cost | 34,993,000 | 26,072,000
Gross Unrealized Gains | 606,000 | 886,000
Gross Unrealized Losses | (329,000) | (10,000)
Fair Value | 35,270,000 | 26,948,000
Municipal securities |  |
Investment Securities |  |
Amortized Cost | 30,962,000 | 28,675,000
Gross Unrealized Gains | 384,000 | 740,000
Gross Unrealized Losses | (349,000) | (2,000)
Fair Value | 30,997,000 | 29,413,000
U.S. Government agency securities |  |
Investment Securities |  |
Amortized Cost | 44,074,000 | 33,346,000
Gross Unrealized Gains |  | 9,000
Gross Unrealized Losses | (2,464,000) | (310,000)
Fair Value | $ 41,610,000 | $ 33,045,000

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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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- Definition Amortized cost 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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