Fair Value Disclosures (Details Textual) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Fair Value Disclosures (Textual) [Abstract]
Carrying amount of impaired loans	$ 45,200,000	$ 45,200,000	$ 41,200,000
Valuation allowance of impaired loans	208,000	208,000	1,253,000
Mortgage servicing rights carrying amount	4,600,000	4,600,000	3,500,000
Mortgage Servicing Rights Valuation Allowance	497,000	497,000	793,000
Amount of nonaccrual commercial loans transferred to loans held for sale				2,600,000
Valuation adjustments for loans held for sale		0	0
Estimated fair value of non-financial intangible			43,100,000
Loans sold loss recognized in other noninterest income	116,000
Real Estate Owned Property with Write-downs [Member]
Fair Value Disclosures (Textual) [Abstract]
Other real estate owned property carrying amount		5,300,000
Other real estate owned property fair value		3,300,000
Impairment charge		$ 2,000,000
Number of other real estate owned properties		3