Significant Accounting Policies (Textual) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Branches	Dec. 31, 2012 Minimum	Dec. 31, 2012 Maximum	Dec. 31, 2012 Minimum	Dec. 31, 2012 Core deposit intangibles Maximum	Dec. 31, 2011 Decrease to Cash Flows from Operating Activities [Member]	Dec. 31, 2010 Decrease to Cash Flows from Operating Activities [Member]
Significant Accounting Policies [Line Items]
Assets	$ 9,193,237	$ 9,493,169	$ 9,236,910
Number of Stores			174
Finite-Lived Intangible Asset, Useful Life				8 years			10 years
Derivative, Remaining Maturity					60 days	10 days
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 0	$ 0						$ 51,300	$ 66,100