Mortgage Servicing Rights and Mortgage Servicing Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012		Jun. 30, 2013 Fair Value, Inputs, Level 3 [Member]		Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Fair Value, Inputs, Level 3 [Member]	Apr. 12, 2013 Citizens Republic Bancorp
Mortage Servicing Rights Amortized Value [Roll Forward]
Mortgage Servicing Rights Beginning of Period	$ 21,378		$ 20,946	$ 21,316		$ 21,179	$ 21,179						$ 1,065
Mortgage Servicing Rights Additions	1,434		1,794	2,701		3,188
Amortization of Mortgage Servicing Rights (MSRs)	(1,273)		1,467	(2,478)		3,094
Mortgage Servicing Rights, End of Period	22,604		21,273	22,604		21,273	21,316						1,065
Mortage Servicing Rights Valuation Rollforward [Roll Forward]
Mortgage Servicing rights Valuation Allowance Beginning of Period	(1,234)		(2,193)	(2,564)		(3,539)	(3,539)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	752		(1,295)	2,082		51	1,000
Mortgage Servicing rights Valuation Allowance, End of Period	(482)		(3,488)	(482)		(3,488)	(2,564)
Mortgage Servicing Rights Net Carrying balance	22,122		17,785	22,122		17,785	18,752
Fair Value of Mortgage Servicing Rights	$ 22,529	[1]	$ 17,913	$ 22,529	[1]	$ 17,913	$ 18,833	[1]	$ 22,529	[1]	$ 18,833	$ 17,913

[1] (b) - MSRs with a recorded investment of $22.6 million were reduced by a specific valuation allowance totaling $0.5 million to a reported carrying value of $22.1 million resulting in recognition of $0.8 million in recoveries included in loans sales and servicing income in the three months ended June 30, 2013.