Fair Value Measurements (Details 2) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Pooled Trust Preferred Securities [Member]
Investments in securities that are classified as level 3
Fair Value	$ 3,617	$ 2,981
Pooled Trust Preferred Securities [Member] | Discounted cash flow methodology [Member] | Minimum [Member]
Investments in securities that are classified as level 3
Cumulative Prepayment	0.00%	0.00%
Cumulative Default	2.00%	3.00%
Loss Given Default	85.00%	85.00%
Cure Given Default	0.00%	0.00%
Pooled Trust Preferred Securities [Member] | Discounted cash flow methodology [Member] | Maximum [Member]
Investments in securities that are classified as level 3
Cumulative Prepayment	76.00%	76.00%
Cumulative Default	100.00%	100.00%
Loss Given Default	100.00%	100.00%
Cure Given Default	75.00%	75.00%
Pooled Trust Preferred Securities [Member] | Discounted cash flow methodology [Member] | Weighted Average [Member]
Investments in securities that are classified as level 3
Cumulative Prepayment	7.20%	7.50%
Cumulative Default	18.60%	19.60%
Loss Given Default	95.40%	94.90%
Cure Given Default	36.60%	33.80%
PRIVATIVE MORTGAGE-BACKED SECURITIES [Member]
Investments in securities that are classified as level 3
Fair Value	3,036	3,532
PRIVATIVE MORTGAGE-BACKED SECURITIES [Member] | Multi-dimensional spread tables [Member] | Minimum [Member]
Investments in securities that are classified as level 3
Cumulative Prepayment	14.40%	10.30%
Constant Default Rate	0.80%	9.00%
Loss Severity	21.00%	20.00%
PRIVATIVE MORTGAGE-BACKED SECURITIES [Member] | Multi-dimensional spread tables [Member] | Maximum [Member]
Investments in securities that are classified as level 3
Cumulative Prepayment	14.50%	14.50%
Constant Default Rate	20.30%	20.40%
Loss Severity	52.00%	55.00%
PRIVATIVE MORTGAGE-BACKED SECURITIES [Member] | Multi-dimensional spread tables [Member] | Weighted Average [Member]
Investments in securities that are classified as level 3
Cumulative Prepayment	14.50%	13.90%
Constant Default Rate	4.00%	4.00%
Loss Severity	34.10%	33.60%
IMPAIRED LOANS [Member]
Investments in securities that are classified as level 3
Fair Value	10,105	7,817
OTHER REAL ESTATE OWNED [Member]
Investments in securities that are classified as level 3
Fair Value	$ 9,211	$ 11,974