Goodwill and Other Intangible Assets Summary of Core Deposit and Other Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Core Deposits Member	Dec. 31, 2013 Core Deposits Member	Mar. 31, 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			(32,336)	(31,565)	(12,984)	(12,764)
Net book value			3,894	4,665	6,299	6,519
Amortization of other intangible assets	$ 991	$ 1,011	$ 771	$ 3,122	$ 220	$ 921