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Investments (Unrealized Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 153,281 | $ 153,552
Gross Unrealized Gains | 182 | 367
Gross Unrealized Losses | 7,859 | 7,449
Investment securities - available-for-sale (at fair value) | 145,604 | 146,470
OTTI in AOCI | (2,506) | (3,389)
Held-to-maturity amortized cost | 91,878 | 93,632
Held-to-maturity Gross Unrealized Gains | 1,117 | 2,220
Held-to-maturity gross unrealized losses | 1,660 | 506
Investment securities - HTM | 91,335 | 95,346
Held-to-maturity OTTI in AOCI | 0 | 0
US government agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 30,000 | 30,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,139 | 744
Investment securities - available-for-sale (at fair value) | 28,861 | 29,256
OTTI in AOCI | 0 | 0
Held-to-maturity amortized cost | 15,911 | 15,876
Held-to-maturity Gross Unrealized Gains | 116 | 447
Held-to-maturity gross unrealized losses | 0 | 0
Investment securities - HTM | 16,027 | 16,323
Held-to-maturity OTTI in AOCI | 0 | 0
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity amortized cost | 46,312 | 47,771
Held-to-maturity Gross Unrealized Gains | 12 | 94
Held-to-maturity gross unrealized losses | 1,216 | 423
Investment securities - HTM | 45,108 | 47,442
Held-to-maturity OTTI in AOCI | 0 | 0
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 41,431 | 41,771
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,403 | 880
Investment securities - available-for-sale (at fair value) | 40,028 | 40,891
OTTI in AOCI | 0 | 0
Held-to-maturity amortized cost | 17,090 | 17,288
Held-to-maturity Gross Unrealized Gains | 66 | 236
Held-to-maturity gross unrealized losses | 166 | 6
Investment securities - HTM | 16,990 | 17,518
Held-to-maturity OTTI in AOCI | 0 | 0
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 40,229 | 41,298
Gross Unrealized Gains | 1 | 2
Gross Unrealized Losses | 1,341 | 916
Investment securities - available-for-sale (at fair value) | 38,889 | 40,384
OTTI in AOCI | 0 | 0
Held-to-maturity amortized cost | 4,055 | 4,187
Held-to-maturity Gross Unrealized Gains | 0 | 0
Held-to-maturity gross unrealized losses | 187 | 69
Investment securities - HTM | 3,868 | 4,118
Held-to-maturity OTTI in AOCI | 0 | 0
Obligations of states and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 21,915 | 20,772
Gross Unrealized Gains | 181 | 365
Gross Unrealized Losses | 247 | 118
Investment securities - available-for-sale (at fair value) | 21,849 | 21,019
OTTI in AOCI | 0 | 0
Held-to-maturity amortized cost | 8,510 | 8,510
Held-to-maturity Gross Unrealized Gains | 923 | 1,443
Held-to-maturity gross unrealized losses | 91 | 8
Investment securities - HTM | 9,342 | 9,945
Held-to-maturity OTTI in AOCI | 0 | 0
Collateralized debt obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 19,706 | 19,711
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3,729 | 4,791
Investment securities - available-for-sale (at fair value) | 15,977 | 14,920
OTTI in AOCI | $ (2,506) | $ (3,389)

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284427-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284427-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (dd) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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