Premises and Equipment (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Premises and equipment
Total premises and equipment			$ 99,742,000	$ 95,212,000
Accumulated depreciation and amortization			(53,112,000)	(50,196,000)
Net premises and equipment			46,630,000	45,016,000
Proceeds from sale of building parking garage	1,950,000
Commitment to investment in property in South Bend prior to December 31, 2013				5,400,000
Gain on sale of parking garage		1,610,000
Gain on sale of parking garage, net of tax		1,000,000
Depreciation and amortization of properties and equipment			4,727,000	4,241,000	3,733,000
Land
Premises and equipment
Total premises and equipment			14,029,000	13,944,000
Buildings and improvements
Premises and equipment
Total premises and equipment			48,149,000	44,601,000
Furniture and equipment
Premises and equipment
Total premises and equipment			$ 37,564,000	$ 36,667,000