Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 919	$ 0	$ 0
Intangible Assets, Net (Excluding Goodwill)	25,852	15,721	20,166
Goodwill and Intangible Assets [Roll Forward]
Total goodwill, beginning of period	115,554	115,554	109,639
Established through acquisitions	228,398	0	5,915
Total goodwill, end of period	343,952	115,554	115,554
Core deposit intangible, net, beginning of period	15,721
CDI current period amortization	(6,045)	(4,445)	(4,319)
Total core deposit intangible, end of period	25,852	15,721
Total goodwill and intangible assets, end of period	369,804	131,275	135,720
Core Deposits [Member]
Goodwill and Intangible Assets [Roll Forward]
Gross core deposit intangible balance, beginning of period	32,441	32,441	26,652
Accumulated amortization, beginning of period	(16,720)	(12,275)	(7,956)
Core deposit intangible, net, beginning of period	15,721	20,166	18,696
Established through acquisitions	15,257	0	5,789
CDI current period amortization	(6,045)	(4,445)	(4,319)
Total core deposit intangible, end of period	$ 24,933	$ 15,721	$ 20,166
Estimated life of CDI, in years	10 years