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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 189,589	$ 139,445	$ 113,747
Other comprehensive loss:
Change in unrealized net holding losses on securities	(16,201)	(5,796)	(21,273)
Reclassification adjustments for gains realized in income	0	(301)	(950)
Tax effect	4,996	2,570	9,398
Other comprehensive loss, net of tax	(11,205)	(3,527)	(12,825)
Total comprehensive income	$ 178,384	$ 135,918	$ 100,922

X

- Definition

This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

+ References

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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