Investments (Additional Information Of Trust Preferred Securities With Credit Rating Below Investment Grade) (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost	$ 330,037,000		$ 370,315,000
Securities held-to-maturity, Amortized Cost	3,994,000		13,454,000
Securities available-for-sale, Estimated Fair Value	329,247,000		377,122,000
Investment securities held-to-maturity, fair value	6,406,000		13,861,000
Model assumption, recovery rate	0.00%
P3 [Member]
Schedule of Investments [Line Items]
Other than temporary impairment losses	0		11,000
P4 [Member]
Schedule of Investments [Line Items]
Model assumption, number of banks deferring will cure	1
Other than temporary impairment losses	0		565,000
Available-for-sale Securities [Member] | P1 [Member]
Schedule of Investments [Line Items]
Type	Pooled
Class	Mezz
Original Cost	827,000
Available-for-sale Securities, Amortized Cost	268,000
Securities available-for-sale, Estimated Fair Value	368,000
Difference (1)	100,000	[1]
Lowest Credit Rating	Caa3
Number of issuers currently performing	7
Actual deferrals/defaults (as a % of original dollar)	19.50%
Expected deferrals/defaults (as a % of remaining of performing collateral)	21.00%	[2]
Excess Subordination as a Percentage of Current Performing Collateral (4)	52.50%	[3]
Available-for-sale Securities [Member] | P2 [Member]
Schedule of Investments [Line Items]
Type	Pooled
Class	Mezz
Original Cost	3,279,000
Available-for-sale Securities, Amortized Cost	436,000
Securities available-for-sale, Estimated Fair Value	1,252,000
Difference (1)	816,000	[1]
Lowest Credit Rating	Ca
Number of issuers currently performing	6
Actual deferrals/defaults (as a % of original dollar)	22.30%
Expected deferrals/defaults (as a % of remaining of performing collateral)	5.20%	[2]
Excess Subordination as a Percentage of Current Performing Collateral (4)	23.40%	[3]
Available-for-sale Securities [Member] | P3 [Member]
Schedule of Investments [Line Items]
Type	Pooled	[4]
Class	Mezz	[4]
Original Cost	2,962,000	[4]
Available-for-sale Securities, Amortized Cost	1,419,000	[4]
Securities available-for-sale, Estimated Fair Value	365,000	[4]
Difference (1)	(1,054,000)	[1],[4]
Lowest Credit Rating	Caa3	[4]
Number of issuers currently performing	22	[4]
Actual deferrals/defaults (as a % of original dollar)	25.50%	[4]
Expected deferrals/defaults (as a % of remaining of performing collateral)	8.20%	[2],[4]
Excess Subordination as a Percentage of Current Performing Collateral (4)	12.90%	[3],[4]
Available-for-sale Securities [Member] | P4 [Member]
Schedule of Investments [Line Items]
Type	Pooled	[5]
Class	Mezz	[5]
Original Cost	4,060,000	[5]
Available-for-sale Securities, Amortized Cost	400,000	[5]
Securities available-for-sale, Estimated Fair Value	130,000	[5]
Difference (1)	(270,000)	[1],[5]
Lowest Credit Rating	Ca	[5]
Number of issuers currently performing	9	[5]
Actual deferrals/defaults (as a % of original dollar)	19.20%	[5]
Expected deferrals/defaults (as a % of remaining of performing collateral)	7.10%	[5],[6]
Excess Subordination as a Percentage of Current Performing Collateral (4)	22.80%	[3],[5]
Available-for-sale Securities [Member] | P5 [Member]
Schedule of Investments [Line Items]
Type	Pooled
Class	Mezz
Original Cost	6,228,000
Available-for-sale Securities, Amortized Cost	826,000
Securities available-for-sale, Estimated Fair Value	457,000
Difference (1)	(369,000)	[1]
Lowest Credit Rating	Ca
Number of issuers currently performing	9
Actual deferrals/defaults (as a % of original dollar)	26.00%	[5]
Expected deferrals/defaults (as a % of remaining of performing collateral)	21.00%	[2]
Excess Subordination as a Percentage of Current Performing Collateral (4)	24.70%	[3]
Available-for-sale Securities [Member] | S5 [Member]
Schedule of Investments [Line Items]
Type	Single
Original Cost	261,000
Available-for-sale Securities, Amortized Cost	235,000
Securities available-for-sale, Estimated Fair Value	289,000
Difference (1)	54,000	[1]
Lowest Credit Rating	NR
Number of issuers currently performing	1
Actual deferrals/defaults (as a % of original dollar)	0.00%
Expected deferrals/defaults (as a % of remaining of performing collateral)	0.00%
Held-to-maturity Securities [Member] | P6 [Member]
Schedule of Investments [Line Items]
Type	Pooled
Class	Mezz
Original Cost	1,599,000
Securities held-to-maturity, Amortized Cost	0
Investment securities held-to-maturity, fair value	737,000
Difference (1)	737,000	[1]
Lowest Credit Rating	Caa3
Number of issuers currently performing	7
Actual deferrals/defaults (as a % of original dollar)	19.50%
Expected deferrals/defaults (as a % of remaining of performing collateral)	21.00%	[2]
Excess Subordination as a Percentage of Current Performing Collateral (4)	52.50%	[3]
Held-to-maturity Securities [Member] | P7 [Member]
Schedule of Investments [Line Items]
Type	Pooled
Class	Mezz
Original Cost	4,354,000
Securities held-to-maturity, Amortized Cost	0
Investment securities held-to-maturity, fair value	1,669,000
Difference (1)	1,669,000	[1]
Lowest Credit Rating	Ca
Number of issuers currently performing	6
Actual deferrals/defaults (as a % of original dollar)	22.30%
Expected deferrals/defaults (as a % of remaining of performing collateral)	5.20%	[2]
Excess Subordination as a Percentage of Current Performing Collateral (4)	23.40%	[3]
Held-to-maturity Securities [Member] | S9 [Member]
Schedule of Investments [Line Items]
Type	Single
Original Cost	4,000,000
Securities held-to-maturity, Amortized Cost	3,994,000
Investment securities held-to-maturity, fair value	4,000,000
Difference (1)	$ 6,000	[1]
Lowest Credit Rating	NR
Number of issuers currently performing	1
Actual deferrals/defaults (as a % of original dollar)	0.00%
Expected deferrals/defaults (as a % of remaining of performing collateral)	0.00%

[1] The differences noted consist of unrealized gains (losses) recorded at September 30, 2013 and noncredit other-than-temporary impairment losses recorded subsequent to April 1, 2009 that have not been reclassified as credit losses.

[2] Performing collateral is defined as total collateral minus all collateral that has been called, is currently deferring, or currently in default. This model for this security assumes that all collateral that is currently deferring will default with a zero recovery rate. The underlying issuers can cure, thus this bond could recover at a higher percentage upon default than zero.

[3] Excess subordination is defined as the additional defaults/deferrals necessary in the next reporting period to deplete the entire credit enhancement (excess interest and over-collateralization) beneath our tranche within each pool to the point that would cause a "break in yield." This amount assumes that all currently performing collateral continues to perform. A break in yield means that our security would not be expected to receive all the contractual cash flows (principal and interest) by maturity. The "percent of current performing collateral" is the ratio of the "excess subordination amount" to current performing collateral—a higher percent means there is more excess subordination to absorb additional defaults/deferrals, and the better our security is protected from loss.

[4] ther-than-temporary impairment losses were recognized during the nine months ended September 30, 2013. Other-than-temporary impairment losses of $11,000 were recognized during the year ended December 31, 2012.

[5] ther-than-temporary impairment losses were recognized during the nine months ended September 30, 2013. Other-than-temporary impairment losses of $565,000 were recognized during the year ended December 31, 2012.

[6] Performing collateral is defined as total collateral minus all collateral that has been called, is currently deferring, or currently in default. The model for this security assumes that one of the banks that is currently deferring will cure. If additional underlying issuers cure, this bond could recover at a higher percentage.