Subsequent Events (Details) (USD $)	0 Months Ended
	May 01, 2013
Subsequent Event [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 38,500,000
First Lansing Bancorp, Inc. [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Fair value of assets acquired, at the acquisition date	365,000,000
Assumed deposits	$ 323,000,000
Percentage of Merger Costs Paid in Cash	40.00%
Percentage of Merger Costs Paid With Shares	60.00%
First Lansing Bancorp, Inc. [Member] | Chicago, Illinois [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of locations	7
First Lansing Bancorp, Inc. [Member] | Northwest Indiana [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of locations	1