Fair Value Disclosures (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Real Estate Owned Property with Write-downs [Member]	Mar. 31, 2012 Real Estate Owned Property with Write-downs [Member]
Fair Value Disclosures (Textual) [Abstract]
Carrying amount of impaired loans	$ 43,730,000		$ 43,730,000		$ 41,201,000
Valuation allowance of impaired loans	432,000		432,000		1,253,000
Mortgage servicing rights carrying amount	3,900,000		3,900,000		3,500,000
Mortgage Servicing Rights Valuation Allowance	608,000		608,000		793,000
Other real estate owned individual property carrying amount						2,700,000	930,000
Other Real Estate Owned Property Fair Value						1,600,000	689,000
Realized gains or losses	0	0	0	0
Impairment charge						1,100,000	241,000
Valuation adjustments for loans held for sale			0		0
Estimated fair value of non-financial intangible	$ 43,100,000		$ 43,100,000