Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net change in unrealized gain (loss) on available-for-sale securities, tax effect	$ 1,873	$ (4,275)	$ 10,982
Net reclassification adjustmetn for gains included in net income, tax effect	1	158	275
Net change in unrealized gains (losses) on cash flow hedging derivatives, tax effect	825	2,431	(1,947)
Net reclassification adjustments for effective portion of cash flow hedges included in interest expense, tax effect	(593)	(600)	(564)
Net change in unrealized gains (losses) on cash flow hedging derivatives, tax effect	232	1,831	(2,510)
Net actuarial (loss) gain, tax effect	21	225	(391)
Reclassification of amortization of net unrecognized actuarial loss and of prior service cost included in net periodic cost, tax effect	$ (84)	$ (51)	$ (94)