Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Unrealized holding gains arising during the period net of tax effects	$ 5,313	$ 6,246	$ 19,015	$ 838
Reclassification adjustment for gains included in net income net of tax effects	626	316	695	451
Change in fair value of derivative instruments designated as cash flow hedges net of tax effects	$ 1,252	$ 1,636	$ 3,475	$ 1,636