Fair Value (Details) - Carrying Value of Level 3 Securities Available-for-Sale - CDOs - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Rollforward of the Carrying Value of CDOs [Roll Forward]
Beginning balance		$ 30,431	$ 32,004	$ 31,529	$ 33,774
Change in other comprehensive income	[1]	1,794	(62)	764	(1,560)
Paydowns		(326)	(72)	(394)	(344)
Ending balance		$ 31,899	$ 31,870	$ 31,899	$ 31,870

[1] Included in unrealized holding gains in the Consolidated Statements of Comprehensive Income.