Fair Value (Details) - Carrying Value of Level 3 Securities Available-for-Sale - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Rollforward of the Carrying Value of CDOs [Roll Forward]
Beginning balance		$ 32,004	$ 18,436	$ 33,774	$ 18,309
Change in other comprehensive income (loss)	[1]	(62)	(65)	(1,560)	1,571
Paydowns		(72)	(2)	(344)	(1,511)
Ending balance		$ 31,870	$ 18,369	$ 31,870	$ 18,369

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