Contingencies and Guarantees Contingencies and Guarantees (Schedule of Changes in Repurchase Reserve) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 2,013	$ 2,063	$ 1,743	$ 2,833
Net realized losses	(202)	(96)	(569)	(356)
Net increase to reserve	482	7	1,119	(503)
Balance at end of period	2,293	1,974	2,293	1,974
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	750		470	600	465
Net realized losses	(202)	(96)	(569)	(321)
Net increase to reserve	552	1	1,199	91
Balance at end of period	1,100	370	1,100	370	465
Manufactured housing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	1,263		1,273	2,233	1,598
Net realized losses	0	0	0	(35)
Net increase to reserve	(70)	6	(80)	(594)
Balance at end of period	$ 1,193	$ 1,604	$ 1,193	$ 1,604	$ 1,598