Securities (Non-Agency Collateralized Mortgage Obligations) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011
Book Value	$ 28,347
Original, Credit Support%	4.10%
Current, Credit Support%	9.50%
LTV, Subordination Data	57.30%
Credit Score, Subordination Data	719
Security 1 [Member]
Original Year	2003
Book Value	3,247
S & P, Credit Rating	AAA
Moodys, Credit Rating	n/a
Original, Credit Support%	2.50%
Current, Credit Support%	5.80%
30 Day, Delinquency%, Subordination Data	1.40%
60 Day, Delinquency%, Subordination Data	0.10%
90 Day, Delinquency%, Subordination Data	0.60%
%, Foreclosure, Subordination Data	0.80%
%, Foreclosure, OREO, Subordination Data	0.00%
Bankruptcy, Subordination Data	0.50%
Total Delinquency, Subordination Data	3.40%
LTV, Subordination Data	52.10%
Credit Score, Subordination Data	738
Security 2 [Member]
Original Year	2003
Book Value	2,265
S & P, Credit Rating	AAA
Moodys, Credit Rating	n/a
Original, Credit Support%	4.30%
Current, Credit Support%	16.30%
30 Day, Delinquency%, Subordination Data	2.00%
60 Day, Delinquency%, Subordination Data	1.20%
90 Day, Delinquency%, Subordination Data	5.00%
%, Foreclosure, Subordination Data	2.60%
%, Foreclosure, OREO, Subordination Data	0.30%
Bankruptcy, Subordination Data	1.20%
Total Delinquency, Subordination Data	12.20%
LTV, Subordination Data	56.00%
Credit Score, Subordination Data	710
Security 3 [Member]
Original Year	2003
Book Value	1,519
S & P, Credit Rating	AAA
Moodys, Credit Rating	n/a
Original, Credit Support%	2.00%
Current, Credit Support%	6.50%
30 Day, Delinquency%, Subordination Data	0.60%
60 Day, Delinquency%, Subordination Data	0.50%
90 Day, Delinquency%, Subordination Data	1.50%
%, Foreclosure, Subordination Data	1.30%
%, Foreclosure, OREO, Subordination Data	0.20%
Bankruptcy, Subordination Data	1.10%
Total Delinquency, Subordination Data	5.10%
LTV, Subordination Data	47.30%
Credit Score, Subordination Data	742
Security 4 [Member]
Original Year	2003
Book Value	1,522
S & P, Credit Rating	AAA
Moodys, Credit Rating	n/a
Original, Credit Support%	2.70%
Current, Credit Support%	18.20%
30 Day, Delinquency%, Subordination Data	0.80%
60 Day, Delinquency%, Subordination Data	0.00%
90 Day, Delinquency%, Subordination Data	1.60%
%, Foreclosure, Subordination Data	2.20%
%, Foreclosure, OREO, Subordination Data	0.00%
Bankruptcy, Subordination Data	1.10%
Total Delinquency, Subordination Data	5.70%
LTV, Subordination Data	50.40%
Security 5 [Member]
Original Year	2004
Book Value	3,720
S & P, Credit Rating	AAA
Moodys, Credit Rating	Baa2
Original, Credit Support%	7.00%
Current, Credit Support%	20.10%
30 Day, Delinquency%, Subordination Data	0.90%
60 Day, Delinquency%, Subordination Data	1.20%
90 Day, Delinquency%, Subordination Data	2.00%
%, Foreclosure, Subordination Data	7.00%
%, Foreclosure, OREO, Subordination Data	1.20%
Bankruptcy, Subordination Data	0.80%
Total Delinquency, Subordination Data	13.00%
LTV, Subordination Data	55.80%
Credit Score, Subordination Data	689
Security 6 [Member]
Original Year	2004
Book Value	2,631
S & P, Credit Rating	AA+
Moodys, Credit Rating	n/a
Original, Credit Support%	5.30%
Current, Credit Support%	10.40%
30 Day, Delinquency%, Subordination Data	0.60%
60 Day, Delinquency%, Subordination Data	0.00%
90 Day, Delinquency%, Subordination Data	2.40%
%, Foreclosure, Subordination Data	3.10%
%, Foreclosure, OREO, Subordination Data	0.00%
Bankruptcy, Subordination Data	1.90%
Total Delinquency, Subordination Data	8.00%
LTV, Subordination Data	46.50%
Credit Score, Subordination Data	734
Security 7 [Member]
Original Year	2004
Book Value	1,260
S & P, Credit Rating	n/a
Moodys, Credit Rating	A1-
Original, Credit Support%	2.50%
Current, Credit Support%	8.50%
30 Day, Delinquency%, Subordination Data	0.00%
60 Day, Delinquency%, Subordination Data	1.10%
90 Day, Delinquency%, Subordination Data	0.00%
%, Foreclosure, Subordination Data	4.80%
%, Foreclosure, OREO, Subordination Data	0.00%
Bankruptcy, Subordination Data	0.00%
Total Delinquency, Subordination Data	5.90%
LTV, Subordination Data	56.00%
Credit Score, Subordination Data	736
Security 8 [Member]
Original Year	2004
Book Value	1,881
S & P, Credit Rating	AAA
Moodys, Credit Rating	Baa2
Original, Credit Support%	4.40%
Current, Credit Support%	9.30%
30 Day, Delinquency%, Subordination Data	1.30%
60 Day, Delinquency%, Subordination Data	0.50%
90 Day, Delinquency%, Subordination Data	0.50%
%, Foreclosure, Subordination Data	2.60%
%, Foreclosure, OREO, Subordination Data	0.50%
Bankruptcy, Subordination Data	1.10%
Total Delinquency, Subordination Data	6.50%
LTV, Subordination Data	55.10%
Credit Score, Subordination Data	733
Security 9 [Member]
Original Year	2005
Book Value	6,518
S & P, Credit Rating	CCC
Moodys, Credit Rating	Caa1
Original, Credit Support%	5.10%
Current, Credit Support%	5.00%
30 Day, Delinquency%, Subordination Data	3.60%
60 Day, Delinquency%, Subordination Data	2.10%
90 Day, Delinquency%, Subordination Data	12.20%
%, Foreclosure, Subordination Data	5.40%
%, Foreclosure, OREO, Subordination Data	0.50%
Bankruptcy, Subordination Data	2.50%
Total Delinquency, Subordination Data	26.20%
LTV, Subordination Data	65.50%
Credit Score, Subordination Data	706
Security 10 [Member]
Original Year	2005
Book Value	$ 3,784
S & P, Credit Rating	CCC
Moodys, Credit Rating	B3
Original, Credit Support%	4.70%
Current, Credit Support%	3.20%
30 Day, Delinquency%, Subordination Data	3.50%
60 Day, Delinquency%, Subordination Data	2.20%
90 Day, Delinquency%, Subordination Data	3.80%
%, Foreclosure, Subordination Data	9.10%
%, Foreclosure, OREO, Subordination Data	1.20%
Bankruptcy, Subordination Data	1.60%
Total Delinquency, Subordination Data	21.40%
LTV, Subordination Data	65.80%
Credit Score, Subordination Data	726