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