Business Combinations Acquisition Pro Forma Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition, Pro Forma Information [Line Items]
Income Tax Expense (Benefit)	$ 15,958	$ 13,096	$ 52,553	$ 37,802
Citizens Republic Bancorp
Business Acquisition, Pro Forma Information [Line Items]
Income Tax Expense (Benefit)			276,800
Total revenue, net of interest expense	342,756	325,086	959,045	949,884
Net income	$ 66,237	$ 89,193	$ 221,468	$ 528,691	[1]

[1] Note: 2012 net income includes approximately $276.8 million of tax benefits as a result of Citizens restoration of its DTA.