Fair Value (Details) - Carrying Value of Level 3 Securities Available-for-Sale - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Rollforward of the Carrying Value of CDOs [Roll Forward]
Beginning balance		$ 33,928	$ 21,666	$ 33,774	$ 18,309
Change in other comprehensive income (loss)	[1]	(1,798)	(1,721)	(1,498)	1,636
Paydowns		(126)	(1,509)	(272)	(1,509)
Ending balance		$ 32,004	$ 18,436	$ 32,004	$ 18,436

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