Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)	$ (4)	$ (14)	$ 64	$ 130
Tax expense (benefit)	4,197	4,376	8,883	9,360
Net income	11,566	12,402	23,168	23,340
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)	(4)	(14)	64	130
Tax expense (benefit)	(1)	(5)	23	45
Net income	$ (3)	$ (9)	$ 41	$ 85