Mortgage Servicing Rights (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Mortgage Servicing Rights
Loan servicing fees	$ 4,070,000	$ 4,095,000	$ 4,040,000
Net gain on sales of loans	7,590,000	3,716,000	4,929,000
Amortization of MSR	(3,909,000)	(3,250,000)	(3,450,000)
(Provision for) recovery of valuation allowance on MSR	(931,000)	(148,000)	703,000
Total mortgage banking income, net	6,820,000	4,413,000	6,222,000
Estimated future MSR amortization
2013	3,400,000
2014	2,700,000
2015	2,100,000
2016	1,600,000
2017	$ 1,300,000