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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 16,582	$ 7,037	$ 14,780	$ 23,619	$ 23,338
Unrealized gain (loss) on available-for-sale securities:
Unrealized gain (loss) arising during the period	5,423	6,173	(7,631)	11,596	(21,192)
Reclassification adjustment for gain included in net income	0	(147)	(197)	(147)	(3,901)
Total change in unrealized gain (loss) on available-for-sale securities	5,423	6,026	(7,828)	11,449	(25,093)
Total other comprehensive income (loss)	5,423	6,026	(7,828)	11,449	(25,093)
Comprehensive income (loss)	$ 22,005	$ 13,063	$ 6,952	$ 35,068	$ (1,755)

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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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