Loans Held-for-Sale (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loans held-for-sale
Loans held-for-sale, net	$ 31,548,000		$ 76,306,000
Other asset impairment charges	33,000	54,000
Mortgage loans held-for-sale | Low end of the range
Loans held-for-sale
Mortgage loan, original term	15 years
Mortgage loans held-for-sale | High end of the range
Loans held-for-sale
Mortgage loan, original term	30 years
Non-performing loans held-for-sale, net
Loans held-for-sale
Loans held-for-sale, net	8,200,000		3,900,000
Loans held-for-sale, valuation allowance	97,000		64,000
Sale of delinquent and non-performing mortgage loans, net of charge-offs, amount	5,000,000	14,600,000
Charge-offs on delinquent and non-performing mortgage loans sold	1,300,000	8,100,000
Net gain (loss) on sales of loans	138,000	950,000
Other asset impairment charges	$ 33,000	$ 54,000