Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 20,549	$ 18,101	$ 19,876
Change in fair value of derivative instruments:
Change in fair value of derivative instruments for the period	195	(511)	2,668
Income tax effect	(68)	179	(934)
Changes from derivative instruments	127	(332)	1,734
Change in securities:
Unrealized appreciation (depreciation) for the period on AFS securities	(2,910)	4,841	(18,956)
Unrealized depreciation for the period on held-to-maturity securities	(549)	1,658
Reclassification adjustment for securities gains realized in income	(189)	(988)	(374)
Income tax effect	1,277	(1,929)	6,766
Unrealized gains (losses) on securities	(2,371)	3,582	(12,564)
Other Comprehensive Income (Loss), Net of Tax	(2,244)	3,250	(10,830)
Comprehensive Income	$ 18,305	$ 21,351	$ 9,046