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Securities Available-for-Sale (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available-for-sale |  |
Securities, Amortized Cost | $ 421,147 | $ 436,868
Securities, Gross Unrealized Gains | 974 | 2,886
Securities, Gross Unrealized Losses | (12,082) | (4,470)
Securities, Fair Value | 410,039 | 435,284
Federal agency obligations [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 48,963 | 56,297
Securities, Gross Unrealized Gains | 14 | 141
Securities, Gross Unrealized Losses | (1,443) | (416)
Securities, Fair Value | 47,534 | 56,022
Residential mortgage pass-through securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 196,650 | 183,509
Securities, Gross Unrealized Gains | 75 | 330
Securities, Gross Unrealized Losses | (6,174) | (1,948)
Securities, Fair Value | 190,551 | 181,891
Commercial mortgage pass-through securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 3,953 | 4,054
Securities, Gross Unrealized Gains |  | 3
Securities, Gross Unrealized Losses | (110) | (3)
Securities, Fair Value | 3,843 | 4,054
Obligations of U.S. states and political subdivisions [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 133,564 | 130,723
Securities, Gross Unrealized Gains | 727 | 1,739
Securities, Gross Unrealized Losses | (3,903) | (1,334)
Securities, Fair Value | 130,388 | 131,128
Corporate bonds and notes [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 26,305 | 29,801
Securities, Gross Unrealized Gains | 96 | 163
Securities, Gross Unrealized Losses | (439) | (271)
Securities, Fair Value | 25,962 | 29,693
Asset-backed securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 10,317 | 12,021
Securities, Gross Unrealized Gains | 59 | 66
Securities, Gross Unrealized Losses | (13) | (37)
Securities, Fair Value | 10,363 | 12,050
Certificates of deposit [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 420 | 621
Securities, Gross Unrealized Gains | 3 | 4
Securities, Gross Unrealized Losses |  |
Securities, Fair Value | 423 | 625
Other securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost | 975 | 3,422
Securities, Gross Unrealized Gains |  |
Securities, Gross Unrealized Losses |  |
Securities, Fair Value | $ 975 | 3,422
Trust preferred securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost |  | 4,577
Securities, Gross Unrealized Gains |  | 205
Securities, Gross Unrealized Losses |  | (111)
Securities, Fair Value |  | 4,671
Equity securities [Member] |  |
Securities available-for-sale |  |
Securities, Amortized Cost |  | 11,843
Securities, Gross Unrealized Gains |  | 235
Securities, Gross Unrealized Losses |  | (350)
Securities, Fair Value |  | $ 11,728

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