Goodwill and Other Intangible Assets Summary of Core Deposit and Other Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Core Deposits Member	Dec. 31, 2013 Core Deposits Member	Sep. 30, 2014 Other Intangible Assets [Member]	Dec. 31, 2013 Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount					$ 36,230	$ 36,230	$ 19,283	$ 19,283
Accumulated amortization					(33,878)	(31,565)	(13,423)	(12,764)
Total Estimated Amortization Expense					2,352	4,665	5,860	6,519
Amortization of other intangible assets	$ 990	$ 1,010	$ 2,972	$ 3,032	$ 2,313	$ 3,122	$ 659	$ 921