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Securities Securities (Held-to-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 37,778 | $ 38,612
Gross unrealized gains | 177 | 87
Gross unrealized losses | (259) | (179)
Fair value | 37,696 | 38,520
U.S. government agency obligations - government-sponsored enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 1,499 | 1,497
Gross unrealized gains | 0 | 2
Gross unrealized losses | (9) | (5)
Fair value | 1,490 | 1,494
Municipal obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 21,680 | 21,173
Gross unrealized gains | 176 | 62
Gross unrealized losses | (34) | (78)
Fair value | 21,822 | 21,157
Collateralized mortgage obligations - government issued |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 9,072 | 9,148
Gross unrealized gains | 1 | 17
Gross unrealized losses | (130) | (38)
Fair value | 8,943 | 9,127
Collateralized mortgage obligations - government-sponsored enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 5,527 | 6,794
Gross unrealized gains | 0 | 6
Gross unrealized losses | (86) | (58)
Fair value | $ 5,441 | $ 6,742

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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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