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Securities Available-for-Sale (Details) - Unrealized gains on investment securities - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
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