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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net change in unrealized losses on available-for-sale securities, net of tax of $1,558, $1,017, and $1,212, respectively $ 1,558 $ 1,017 $ 1,212
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Equity Method, before Tax 591 0 0
Net reclassification adjustment for net losses (gains) included in net income, net of tax of ($142), $299, and $18, respectively(2) (142) 299 18
Net change in unrealized losses on cash flow hedging derivatives, net of tax of ($229), $134, and $343, respectively (229) 134 343
Net reclassification adjustment for effective portion of cash flow hedges, net of tax of ($179), ($557), and ($709), respectively(3) (179) (557) (709)
Net actuarial gain (loss), net of tax of ($375), $723, and $127, respectively (375) (723) 127
Reclassification of amortization of net unrecognized actuarial loss and of net prior service cost included in net periodic cost, net of tax of ($126), ($92), and ($83), respectively(4) $ (126) $ (92) $ (83)