Benefit Plans (Narratives) (Details)	3 Months Ended
	Sep. 30, 2013
FirstMerit | Up to 3% contribution
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	3.00%
FirstMerit | 3% to 5% contribution
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	2.00%
Citizens Republic Bancorp | Up to 2% contribution
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	2.00%
Citizens Republic Bancorp | 3% to6% contribution
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	25.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	6.00%