Acquired Loans Part 2 (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Change in accretable difference on acquired loans [Abstract]
Accretable yield at beginning of period		$ (77,149)	$ (109,006)	$ (109,006)
Accretion to interest income		24,907	38,433
Disposals		8,194	14,520
Reclassification to / (from) nonaccretable difference	[1]	(12,215)	(26,826)
Accretable yield at end of period		$ (56,263)	$ (82,879)	$ (77,149)

[1] Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.