Accumulated Other Comprehensive Income - Reclassification (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]
Securities gains, net	$ 6	$ 315	$ 553	$ 504
Income tax expense	(1,691)	(1,446)	(4,081)	(4,038)
Net income	4,037	$ 3,168	10,432	$ 9,851
Realized gain on sale of securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	6		553
Income tax expense	(3)		(194)
Net income	$ 3		$ 359