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Securities (Held-to-Maturity Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Held-to-maturity Securities |  |
Amortized cost | $ 41,885 | $ 37,778
Gross unrecognized holding gains | 63 | 177
Gross unrecognized holding losses | (539) | (259)
Estimated Fair Value | 41,409 | 37,696
U.S. government agency obligations - government-sponsored enterprises |  |
Schedule of Held-to-maturity Securities |  |
Amortized cost | 1,499 | 1,499
Gross unrecognized holding gains | 0 | 0
Gross unrecognized holding losses | (9) | (9)
Estimated Fair Value | 1,490 | 1,490
Municipal obligations |  |
Schedule of Held-to-maturity Securities |  |
Amortized cost | 21,657 | 21,680
Gross unrecognized holding gains | 48 | 176
Gross unrecognized holding losses | (129) | (34)
Estimated Fair Value | 21,576 | 21,822
Collateralized mortgage obligations - government issued |  |
Schedule of Held-to-maturity Securities |  |
Amortized cost | 8,613 | 9,072
Gross unrecognized holding gains | 0 | 1
Gross unrecognized holding losses | (232) | (130)
Estimated Fair Value | 8,381 | 8,943
Collateralized mortgage obligations - government-sponsored enterprises |  |
Schedule of Held-to-maturity Securities |  |
Amortized cost | 10,116 | 5,527
Gross unrecognized holding gains | 15 | 0
Gross unrecognized holding losses | (169) | (86)
Estimated Fair Value | $ 9,962 | $ 5,441

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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