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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 12,257	$ 26,528	$ 29,458	$ 46,215
Unrealized gain (loss) on available-for-sale securities:
Unrealized gain arising during the period	6,380	7,442	7,680	23,280
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale	12,845	0	12,845	0
Reclassification adjustment for gain included in net income	(642)	(7,594)	(2,602)	(17,602)
Total change in unrealized gain (loss) on available-for-sale securities	18,583	(152)	17,923	5,678
Total other comprehensive income (loss)	18,583	(152)	17,923	5,678
Comprehensive income	$ 30,840	$ 26,376	$ 47,381	$ 51,893

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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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