Commitments and Contingencies (Schedule of Changes in Repurchase Reserve) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Repurchase Reserve, Beginning Balance	$ 8,374	$ 9,851
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	(198)	(2,593)
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	(400)	2,059
Financing Receivable, Repurchase Reserve, Ending Balance	7,776	9,317
Residential Mortgages
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Repurchase Reserve, Assumed Obligation	6,650
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Repurchase Reserve, Beginning Balance	7,250	8,737
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	(198)	(2,593)
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	(402)	2,056
Financing Receivable, Repurchase Reserve, Ending Balance	6,650	8,200
Manufactured Housing
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Repurchase Reserve, Beginning Balance	1,124	1,114
Financing Receivable, Repurchase Reserve Net Realized Gains (Losses)	0	0
Financing Receivable, Repurchase Reserve, Period Increase (Decrease)	2	3
Financing Receivable, Repurchase Reserve, Ending Balance	$ 1,126	$ 1,117