Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	$ 3,724	$ 4,907	$ 13,084	$ 14,995
Net income	11,222	10,924	34,562	33,259
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)	12	(34)	142	(145)
Tax expense (benefit)	4	(12)	50	(51)
Net income	$ 8	$ (22)	$ 92	$ (94)