Loans Receivable and Allowance for Loan Losses (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Loans receivable and allowance for loan losses
Non-performing residential mortgage loans held-for-sale	$ 186,312,000		$ 186,312,000
Amount of loan charge-off	13,631,000	8,104,000	22,466,000	21,458,000
Provision (credited) charged to operations	(5,742,000)	4,526,000	(4,111,000)	13,652,000
Length of period one over which the historical loss experience is analyzed			12 months
Length of period two over which the historical loss experience is analyzed			15 months
Length of period three over which the historical loss experience is analyzed			18 months
Length of period four over which the historical loss experience is analyzed			24 months
Minimum length of period over which the historical loss experience is analyzed for a particular loan type that may not have sufficient loss history			2 years
Extended prior period over which loss experience factors are evaluated to consider trends for the majority of loan portfolio			2 years
Residential | Non-performing loans held-for-sale, net
Loans receivable and allowance for loan losses
Non-performing residential mortgage loans held-for-sale	186,300,000		186,300,000
Amount of loan charge-off			8,700,000
Loans held-for-sale, recorded investment	195,000,000		195,000,000
Provision (credited) charged to operations			$ (5,700,000)