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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income available to common shareholders	$ 22,751	$ 20,979	$ 44,370	$ 38,590
Unrealized gains (losses) on available-for-sale securities arising during the period	14,309	(3,170)	25,671	(13,882)
Reclassification adjustment for gains	(21)	0	(109)	0
Other comprehensive income (loss) before income taxes	14,288	(3,170)	25,562	(13,882)
Tax effect	3,349	(733)	5,992	(3,232)
Other comprehensive income (loss)	10,939	(2,437)	19,570	(10,650)
Comprehensive Income, Net of Tax	$ 33,690	$ 18,542	$ 63,940	$ 27,940

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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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