Income Tax - Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance [Line Items]
Increase (Decrease) in Deferred Tax Assets	$ 29,663
Valuation Allowance	17,171	13,859	15,701
Additional paid-in capital	393,783	256,843
Unrecorded deferred tax liability	4,688
State and Local Jurisdiction
Valuation Allowance [Line Items]
State Tax Loss Carryforward	136,769
Pension and Other Employee Benefits
Valuation Allowance [Line Items]
Increase (Decrease) in Deferred Tax Assets	(5,880)
Deferred Compensation
Valuation Allowance [Line Items]
Increase (Decrease) in Deferred Tax Assets	(1,702)
Available-for-sale securities
Valuation Allowance [Line Items]
Increase (Decrease) in Deferred Tax Assets	8,030
Merger with CFS Bancorp, Inc. (Citizens)
Valuation Allowance [Line Items]
Increase (Decrease) in Deferred Tax Assets	30,265
Additional paid-in capital	13,393
Deferred State Taxes
Valuation Allowance [Line Items]
Valuation Allowance	$ 17,171