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Securities Available-for-Sale (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | $ 408,282 | $ 436,868
Investment Securities, Gross Unrealized Gains | 1,327 | 2,886
Investment Securities, Gross Unrealized Losses | (9,594) | (4,470)
Investment Securities, Fair Value | 400,015 | 435,284
Federal agency obligations [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 52,588 | 56,297
Investment Securities, Gross Unrealized Gains | 20 | 141
Investment Securities, Gross Unrealized Losses | (1,124) | (416)
Investment Securities, Fair Value | 51,484 | 56,022
Residential mortgage pass-through securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 184,639 | 183,509
Investment Securities, Gross Unrealized Gains | 135 | 330
Investment Securities, Gross Unrealized Losses | (4,671) | (1,948)
Investment Securities, Fair Value | 180,103 | 181,891
Commercial mortgage pass-through securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 3,987 | 4,054
Investment Securities, Gross Unrealized Gains |  | 3
Investment Securities, Gross Unrealized Losses | (94) | (3)
Investment Securities, Fair Value | 3,893 | 4,054
Obligations of U.S. states and political subdivisions [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 125,885 | 130,723
Investment Securities, Gross Unrealized Gains | 1,003 | 1,739
Investment Securities, Gross Unrealized Losses | (3,259) | (1,334)
Investment Securities, Fair Value | 123,629 | 131,128
Corporate bonds and notes [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 27,802 | 29,801
Investment Securities, Gross Unrealized Gains | 104 | 163
Investment Securities, Gross Unrealized Losses | (442) | (271)
Investment Securities, Fair Value | 27,464 | 29,693
Asset-backed securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 10,889 | 12,021
Investment Securities, Gross Unrealized Gains | 61 | 66
Investment Securities, Gross Unrealized Losses | (4) | (37)
Investment Securities, Fair Value | 10,946 | 12,050
Certificates of deposit [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 420 | 621
Investment Securities, Gross Unrealized Gains | 4 | 4
Investment Securities, Gross Unrealized Losses |  |
Investment Securities, Fair Value | 424 | 625
Other securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost | 2,072 | 3,422
Investment Securities, Gross Unrealized Gains |  |
Investment Securities, Gross Unrealized Losses |  |
Investment Securities, Fair Value | $ 2,072 | 3,422
Trust preferred securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost |  | 4,577
Investment Securities, Gross Unrealized Gains |  | 205
Investment Securities, Gross Unrealized Losses |  | (111)
Investment Securities, Fair Value |  | 4,671
Equity securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities, Amortized Cost |  | 11,843
Investment Securities, Gross Unrealized Gains |  | 235
Investment Securities, Gross Unrealized Losses |  | (350)
Investment Securities, Fair Value |  | $ 11,728

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