Loans Held-for-Sale (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loans held-for-sale
Loans held-for-sale, net	$ 76,306,000	$ 32,394,000
Net gain (loss) on sales of loans	7,590,000	3,716,000	4,929,000
Other asset impairment charges	272,000	444,000	1,688,000
Non-performing loans held-for-sale, net
Loans held-for-sale
Loans held-for-sale, net	3,900,000	19,700,000
Loans held-for-sale, valuation allowance	64,000	63,000
Sale of delinquent and non-performing mortgage loans, net of charge-offs, amount	22,000,000	26,400,000	51,600,000
Charge-offs on delinquent and non-performing mortgage loans sold	11,500,000	13,800,000	23,100,000
Net gain (loss) on sales of loans	1,300,000	(35,000)	2,100,000
Other asset impairment charges	$ 272,000	$ 444,000	$ 173,000