Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 5,047	$ 4,929	$ 14,447	$ 14,119
Available for sale securities
Unrealized gains arising during period	1,366	253	1,830	4,262
Change in unrealized gains for which a portion of other than temporary impairment has been recognized in earnings	10	94	0	432
Reclassification adjustment for other than temporary impairment included in earnings	0	9	0	9
Reclassification adjustments for gains included in earnings	0	(121)	(75)	(123)
Unrealized gains recognized in other comprehensive income on available for sale securities	1,376	235	1,755	4,580
Income tax expense	482	82	615	1,603
Unrealized gains recognized in other comprehensive income on available for sale securities, net of tax	894	153	1,140	2,977
Derivative instruments
Reclassification adjustment for accretion on settled derivatives	0	95	0	285
Unrealized gains recognized in other comprehensive income on derivative instruments	0	95	0	285
Income tax expense	0	33	0	100
Unrealized gains recognized in other comprehensive income on derivative instruments, net of tax	0	62	0	185
Other comprehensive income	894	215	1,140	3,162
Comprehensive income	$ 5,941	$ 5,144	$ 15,587	$ 17,281