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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Statements of Comprehensive Income      
Net income $ 157,436 $ 133,932 $ 136,726
Other comprehensive income, net of tax:      
Net unrealized holding losses on securities available for sale arising during period (net of tax effects of $(2,586), $(16,585), and $(6,593)) (4,803) (30,801) (12,243)
Reclassification adjustment for losses on securities available for sale included in net income (net of tax effects of $1,671, $919, and $1,289) 3,103 1,707 2,393
Reclassification adjustment for impairment charges on available for sale securities included in net income (net of tax effects of $0, $124, and $334)   230 620
Other comprehensive (loss) income, net of tax (1,700) (28,864) (9,230)
Comprehensive income $ 155,736 $ 105,068 $ 127,496