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Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 419,947 | $ 436,868
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,297 | 2,886
Investment Securities Available-for-Sale, Gross Unrealized Losses | (9,210) | (4,470)
Investment Securities Available-for-Sale, Fair Value | 412,034 | 435,284
Federal Agency Obligations [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 45,509 | 56,297
Investment Securities Available-for-Sale, Gross Unrealized Gains | 51 | 141
Investment Securities Available-for-Sale, Gross Unrealized Losses | (605) | (416)
Investment Securities Available-for-Sale, Fair Value | 44,955 | 56,022
Residential Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 189,721 | 183,509
Investment Securities Available-for-Sale, Gross Unrealized Gains | 85 | 330
Investment Securities Available-for-Sale, Gross Unrealized Losses | (4,602) | (1,948)
Investment Securities Available-for-Sale, Fair Value | 185,204 | 181,891
Commercial Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 3,919 | 4,054
Investment Securities Available-for-Sale, Gross Unrealized Gains |  | 3
Investment Securities Available-for-Sale, Gross Unrealized Losses | (45) | (3)
Investment Securities Available-for-Sale, Fair Value | 3,874 | 4,054
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 141,496 | 130,723
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,091 | 1,739
Investment Securities Available-for-Sale, Gross Unrealized Losses | (3,402) | (1,334)
Investment Securities Available-for-Sale, Fair Value | 139,185 | 131,128
Trust Preferred Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost |  | 4,577
Investment Securities Available-for-Sale, Gross Unrealized Gains |  | 205
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (111)
Investment Securities Available-for-Sale, Fair Value |  | 4,671
Corporate Bonds And Notes [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 26,308 | 29,801
Investment Securities Available-for-Sale, Gross Unrealized Gains | 45 | 163
Investment Securities Available-for-Sale, Gross Unrealized Losses | (540) | (271)
Investment Securities Available-for-Sale, Fair Value | 25,813 | 29,693
Asset-backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 9,685 | 12,021
Investment Securities Available-for-Sale, Gross Unrealized Gains | 22 | 66
Investment Securities Available-for-Sale, Gross Unrealized Losses | (16) | (37)
Investment Securities Available-for-Sale, Fair Value | 9,691 | 12,050
Certificates of Deposit [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 319 | 621
Investment Securities Available-for-Sale, Gross Unrealized Gains | 3 | 4
Investment Securities Available-for-Sale, Gross Unrealized Losses |  |
Investment Securities Available-for-Sale, Fair Value | 322 | 625
Equity Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost |  | 11,843
Investment Securities Available-for-Sale, Gross Unrealized Gains |  | 235
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (350)
Investment Securities Available-for-Sale, Fair Value | 11,460 | 11,728
Other Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 2,990 | 3,422
Investment Securities Available-for-Sale, Gross Unrealized Gains |  |
Investment Securities Available-for-Sale, Gross Unrealized Losses |  |
Investment Securities Available-for-Sale, Fair Value | $ 2,990 | $ 3,422

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