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Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 436,868 | $ 351,928
Investment Securities Available-for-Sale, Gross Unrealized Gains | 2,886 | 4,645
Investment Securities Available-for-Sale, Gross Unrealized Losses | (4,470) | (3,283)
Investment Securities Available-for-Sale, Fair Value | 435,284 | 353,290
Federal Agency Obligations [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 56,297 | 52,826
Investment Securities Available-for-Sale, Gross Unrealized Gains | 141 | 282
Investment Securities Available-for-Sale, Gross Unrealized Losses | (416) | (271)
Investment Securities Available-for-Sale, Fair Value | 56,022 | 52,837
Residential Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 183,509 | 72,922
Investment Securities Available-for-Sale, Gross Unrealized Gains | 330 | 519
Investment Securities Available-for-Sale, Gross Unrealized Losses | (1,948) | (944)
Investment Securities Available-for-Sale, Fair Value | 181,891 | 72,497
Commercial Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 4,054 | 4,186
Investment Securities Available-for-Sale, Gross Unrealized Gains | 3 | 23
Investment Securities Available-for-Sale, Gross Unrealized Losses | (3) |
Investment Securities Available-for-Sale, Fair Value | 4,054 | 4,209
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 130,723 | 148,747
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,739 | 2,789
Investment Securities Available-for-Sale, Gross Unrealized Losses | (1,334) | (931)
Investment Securities Available-for-Sale, Fair Value | 131,128 | 150,605
Trust Preferred Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 4,577 | 5,575
Investment Securities Available-for-Sale, Gross Unrealized Gains | 205 | 242
Investment Securities Available-for-Sale, Gross Unrealized Losses | (111) | (151)
Investment Securities Available-for-Sale, Fair Value | 4,671 | 5,666
Corporate Bonds And Notes [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 29,801 | 36,717
Investment Securities Available-for-Sale, Gross Unrealized Gains | 163 | 586
Investment Securities Available-for-Sale, Gross Unrealized Losses | (271) | (375)
Investment Securities Available-for-Sale, Fair Value | 29,693 | 36,928
Asset-backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 12,021 | 14,867
Investment Securities Available-for-Sale, Gross Unrealized Gains | 66 | 2
Investment Securities Available-for-Sale, Gross Unrealized Losses | (37) | (286)
Investment Securities Available-for-Sale, Fair Value | 12,050 | 14,583
Certificates of Deposit [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 621 | 973
Investment Securities Available-for-Sale, Gross Unrealized Gains | 4 | 10
Investment Securities Available-for-Sale, Gross Unrealized Losses |  |
Investment Securities Available-for-Sale, Fair Value | 625 | 983
Equity Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 11,843 | 11,843
Investment Securities Available-for-Sale, Gross Unrealized Gains | 235 | 192
Investment Securities Available-for-Sale, Gross Unrealized Losses | (350) | (325)
Investment Securities Available-for-Sale, Fair Value | 11,728 | 11,710
Other Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 3,422 | 3,272
Investment Securities Available-for-Sale, Gross Unrealized Gains |  |
Investment Securities Available-for-Sale, Gross Unrealized Losses |  |
Investment Securities Available-for-Sale, Fair Value | $ 3,422 | $ 3,272

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -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 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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