Goodwill and Other Intangible Assets Summary of Core Deposit and Other Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 4,043	$ 4,195	$ 4,714
Core Deposits Member
Summary of core deposit intangibles and other intangibles
Gross carrying amount	36,230	41,831	41,831
Accumulated amortization	(31,565)	(34,044)	(30,815)
Net book value	4,665	7,787	11,016
Amortization of other intangible assets	3,122	3,229	3,695
Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	19,283	19,283	19,283
Accumulated amortization	(12,764)	(11,843)	(10,877)
Net book value	6,519	7,440	8,406
Amortization of other intangible assets	$ 921	$ 966	$ 1,019