Accumulated Other Comprehensive Income ("AOCI") - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses), net	$ 836	$ 867	$ 505
Income taxes	(7,007)	(6,020)	(5,202)
Net Income	16,301	15,039	12,741
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income	543	564	328
Realized gain on sale of securities | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses), net	836	867	505
Income taxes	$ (293)	$ (303)	$ (177)