Mortgage Servicing Rights and Mortgage Servicing Activity-Changes in the carrying amount of mortgage servicing rights (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013		Jun. 30, 2014 Fair Value, Inputs, Level 3		Dec. 31, 2013 Fair Value, Inputs, Level 3	Jun. 30, 2013 Fair Value, Inputs, Level 3	Jun. 30, 2014 Citizens Republic Bancorp	Jun. 30, 2014 Mortgage Servicing Rights [Member] Citizens Republic Bancorp	Apr. 12, 2013 Mortgage Servicing Rights [Member] Citizens Republic Bancorp
Mortage Servicing Rights Amortized Value [Roll Forward]
Mortgage Servicing Rights Beginning of Period	$ 22,469		$ 21,378	$ 22,760		$ 21,316	$ 21,316						$ 0	$ 0	$ 1,065
Mortgage Servicing Rights Additions	643		1,434	1,207		2,701
Amortization of Mortgage Servicing Rights (MSRs)	963		(1,273)	1,817		(2,478)
Mortgage Servicing Rights, End of Period	22,150		22,604	22,150		22,604	22,760						0	0	1,065
Mortage Servicing Rights Valuation Rollforward [Roll Forward]
Mortgage Servicing rights Valuation Allowance Beginning of Period	425		1,234	(282)		(2,564)	(2,564)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	(137)		752	(280)		(2,082)	2,300
Mortgage Servicing rights Valuation Allowance, End of Period	(562)		(482)	(562)		(482)	(282)
Mortgage Servicing Rights Net Carrying balance	21,588		22,122	21,588		22,122	22,500
Fair Value of Mortgage Servicing Rights	$ 21,987	[1]	$ 22,529	$ 21,987	[1]	$ 22,529	$ 23,041	[1]	$ 21,987	[1]	$ 23,041	$ 22,529

[1] (b) - MSRs with a recorded investment of $22.2 million were reduced by a specific valuation allowance totaling $0.6 million to a reported carrying value of $21.6 million resulting in recognition of $0.1 million in expense included in loans sales and servicing income in the three months ended June 30, 2014.