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Securities - Schedule of Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 139,413 $ 139,216
Gross Unrealized Gains 42 1,196
Gross Unrealized Losses 2,234 97
Fair Value 137,221 140,315
Obligations of U.S. Government sponsored entities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 131,507 131,707
Gross Unrealized Gains 0 1,103
Gross Unrealized Losses 2,230 90
Fair Value 129,277 132,720
Obligations of U.S. states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 7,906 7,509
Gross Unrealized Gains 42 93
Gross Unrealized Losses 4 7
Fair Value $ 7,944 $ 7,595