Securities - Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 141,236	$ 139,216
Gross Unrealized Gains	36	1,196
Gross Unrealized Losses	3,040	97
Fair Value	138,232	140,315
Obligations of U.S. Government sponsored entities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	131,407	131,707
Gross Unrealized Gains	0	1,103
Gross Unrealized Losses	3,040	90
Fair Value	128,367	132,720
Obligations of U.S. states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	9,829	7,509
Gross Unrealized Gains	36	93
Gross Unrealized Losses	0	7
Fair Value	$ 9,865	$ 7,595