Contingencies and Guarantees Contingencies and Guarantees (Schedule of Changes in Repurchase Reserve) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2012
Repurchase Reserve [Roll Forward]
Balance at beginning of period	$ 2,833		$ 1,743
Net realized losses	(206)	(243)
Net increase to reserve	141	90
Balance at end of period	1,678	2,680	1,743
Residential Mortgage [Member]
Repurchase Reserve [Roll Forward]
Balance at beginning of period	600		470
Net realized losses	(206)	(225)
Net increase to reserve	136	90
Balance at end of period	400	465	470
Manufactured housing [Member]
Repurchase Reserve [Roll Forward]
Balance at beginning of period	2,233		1,273
Net realized losses	0	(18)
Net increase to reserve	5	0
Balance at end of period	$ 1,278	$ 2,215	$ 1,273