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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 50,856	$ 50,657	$ 149,398	$ 117,581
Other comprehensive (loss) income, net of tax
Unrealized gain (loss) on debt securities arising during the period	9,915	(10,185)	57,930	(28,993)
Change in retirement obligation	269	347	805	1,164
Unrealized gain (loss) on derivatives	73	99	217	414
Other comprehensive income (loss)	10,257	(9,739)	58,952	(27,415)
Comprehensive income	$ 61,113	$ 40,918	$ 208,350	$ 90,166

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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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