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Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Securities |  |
Amortized Cost | $ 90,268 | $ 95,944
Gross Unrealized Gains | 363 | 110
Gross Unrealized Losses | (1,282) | (1,448)
Securities available for sale | 89,349 | 94,606
Collaterized mortgage obligations |  |
Investment Securities |  |
Mortgage-backed, due in monthly installments | 24,063 | 31,997
Gross Unrealized Gains | 20 | 11
Gross Unrealized Losses | (569) | (423)
Mortgage-backed, due in monthly installments | 23,514 | 31,585
Agency mortgage-backed securities |  |
Investment Securities |  |
Mortgage-backed, due in monthly installments | 25,725 | 27,110
Gross Unrealized Gains | 4 | 2
Gross Unrealized Losses | (500) | (429)
Mortgage-backed, due in monthly installments | 25,229 | 26,683
Municipal securities |  |
Investment Securities |  |
Amortized Cost | 35,453 | 34,333
Gross Unrealized Gains | 339 | 92
Gross Unrealized Losses | (159) | (580)
Securities available for sale | 35,633 | 33,845
U.S. Government agency securities |  |
Investment Securities |  |
Amortized Cost | 3,526 | 1,003
Gross Unrealized Losses | (46) | (16)
Securities available for sale | 3,480 | 987
U.S. Treasury securities |  |
Investment Securities |  |
Amortized Cost | 1,501 | 1,501
Gross Unrealized Gains |  | 5
Gross Unrealized Losses | (8) |
Securities available for sale | $ 1,493 | $ 1,506

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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