Goodwill and Other Intangible Assets (Accumulated Amortization of Intangible Asset Schedule) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Core Deposits	Dec. 31, 2012 Core Deposits	Dec. 31, 2013 Noncompete Agreements	Dec. 31, 2012 Noncompete Agreements	Dec. 31, 2013 Lease Agreements	Dec. 31, 2012 Lease Agreements	Apr. 12, 2013 Citizens Republic Bancorp	Apr. 12, 2013 Citizens Republic Bancorp Core Deposits	Dec. 31, 2013 Citizens Republic Bancorp Customer Relationships	Apr. 12, 2013 Citizens Republic Bancorp Customer Relationships
Accumulated amortization of intangible assets
Gross Carrying Amount	$ 102,253	$ 17,479	$ 87,533	$ 16,759	$ 102	$ 102	$ 618	$ 618
Accumulated Amortization	(19,498)	(11,106)	(16,065)	(10,546)	(102)	(76)	(520)	(484)			(2,811)
Net Carrying Amount	82,755	6,373	71,468	6,213	0	26	98	134			11,189
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles									$ 84,774	$ 70,800	$ 14,000	$ 14,000