Accumulated Other Comprehensive Income - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	$ 121	$ 259
Income taxes	(1,406)	(1,601)
Net Income	5,812	4,063
Total reclassifications	6	168
Realized gain on sale of securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications	6	168
Amount Reclassified from AOCI
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net Income		168
Reclassification for ASU 2016-01 adoption	650
Total reclassifications	656
Amount Reclassified from AOCI | Realized gain on sale of securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	8	259
Income taxes	(2)	$ (91)
Net Income	$ 6