Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Details Narrative) (USD $)						9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Feb. 04, 2013 Citizens Republic Bancorp	Dec. 31, 2013 VIE 2	Dec. 31, 2013 VIE 1	Sep. 30, 2013 Junior Subordinated Debt Citizens Republic Bancorp	Dec. 31, 2013 Junior Subordinated Debt Citizens Republic Bancorp	Sep. 30, 2013 Minimum Junior Subordinated Debt Citizens Republic Bancorp	Dec. 31, 2013 Minimum Junior Subordinated Debt Citizens Republic Bancorp	Sep. 30, 2013 Maximum Junior Subordinated Debt Citizens Republic Bancorp	Dec. 31, 2013 Maximum Junior Subordinated Debt Citizens Republic Bancorp
Borrowed Funds [Line Items]
Variable Interest Entity-Aggregate Liquidation Amount Outstanding				$ 25,700,000	$ 48,700,000
Debt Instrument, Face Amount			250,000,000
Debt Instrument, Interest Rate, Stated Percentage			4.35%
Debt Instrument, Description of Variable Rate Basis						LIBOR	LIBOR
Debt Instrument, Basis Spread on Variable Rate								3.10%	3.10%	11.75%	11.75%
Debt Instrument, Interest Rate, Stated Percentage						7.50%	7.50%
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	2,400,000,000	1,200,000,000
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	$ 1,000,000,000	$ 723,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate, Range from	1.54%
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate, Range to	4.12%