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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 19,116	$ 16,206
Other comprehensive income (loss):
Unrealized (depreciation) appreciation of available-for-sale securities	(9,414)	1,258
Reclassification adjustment for realized losses (gains) included in net income	345	(1,285)
Income tax effect	2,184	10
Other comprehensive loss, net of tax	(6,885)	(17)
Comprehensive income	$ 12,231	$ 16,189

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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