Investments (Additional Information Of Trust Preferred Securities With Credit Rating Below Investment Grade) (Details)		9 Months Ended		12 Months Ended
		Sep. 30, 2015 USD ($) issuer	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Investments [Line Items]
Available-for-sale Securities, Amortized Cost		$ 297,909,000		$ 251,954,000
Securities held-to-maturity, Amortized Cost		81,095,000		90,786,000
Investment securities available for sale, at fair value		300,865,000		254,043,000
Securities held-to-maturity, Estimated Fair Value		$ 84,005,000		$ 94,191,000
Model assumption, recovery rate		0.00%		0.00%
Credit-related net investment impairment losses		$ 0	$ 0	$ 0
Marketable Equity Securities [Member] | P1 [Member]
Schedule of Investments [Line Items]
Type		Pooled
Class		Mezz
Original Cost		$ 632,000
Available-for-sale Securities, Amortized Cost		0
Investment securities available for sale, at fair value		0
Difference (1)	[1]	$ 0
Lowest Credit Rating		Caa1
Number of issuers currently performing | issuer		5
Actual deferrals/defaults (as a % of original dollar)		14.50%
Expected deferrals/defaults (as a % of remaining performing collateral)	[2]	0.00%
Excess Subordination as a Percentage of Current Performing Collateral (3)	[3]	0.00%
Marketable Equity Securities [Member] | P2 [Member]
Schedule of Investments [Line Items]
Type		Pooled
Class		Mezz
Original Cost		$ 1,513,000
Available-for-sale Securities, Amortized Cost		0
Investment securities available for sale, at fair value		0
Difference (1)	[1]	$ 0
Lowest Credit Rating		Ca
Number of issuers currently performing | issuer		3
Actual deferrals/defaults (as a % of original dollar)		18.30%
Expected deferrals/defaults (as a % of remaining performing collateral)	[2]	0.00%
Excess Subordination as a Percentage of Current Performing Collateral (3)	[3]	0.00%
Marketable Equity Securities [Member] | P3 [Member]
Schedule of Investments [Line Items]
Type		Pooled
Class		Mezz
Original Cost		$ 2,962,000
Available-for-sale Securities, Amortized Cost		1,419,000
Investment securities available for sale, at fair value		1,007,000
Difference (1)	[1]	$ (412,000)
Lowest Credit Rating		Caa3
Number of issuers currently performing | issuer		19
Actual deferrals/defaults (as a % of original dollar)		20.00%
Expected deferrals/defaults (as a % of remaining performing collateral)	[2]	7.10%
Excess Subordination as a Percentage of Current Performing Collateral (3)	[3]	0.00%
Marketable Equity Securities [Member] | P5 [Member]
Schedule of Investments [Line Items]
Type		Pooled
Class		Mezz
Original Cost		$ 6,032,000
Available-for-sale Securities, Amortized Cost		391,000
Investment securities available for sale, at fair value		838,000
Difference (1)	[1]	$ 447,000
Lowest Credit Rating		C
Number of issuers currently performing | issuer		7
Actual deferrals/defaults (as a % of original dollar)		13.50%
Expected deferrals/defaults (as a % of remaining performing collateral)	[2]	19.00%
Excess Subordination as a Percentage of Current Performing Collateral (3)	[3]	33.60%
Marketable Equity Securities [Member] | S5 [Member]
Schedule of Investments [Line Items]
Type		Single
Original Cost		$ 261,000
Available-for-sale Securities, Amortized Cost		235,000
Investment securities available for sale, at fair value		247,000
Difference (1)	[1]	$ 12,000
Lowest Credit Rating		NR
Number of issuers currently performing | issuer		1
Actual deferrals/defaults (as a % of original dollar)		0.00%
Expected deferrals/defaults (as a % of remaining performing collateral)		0.00%
Held-to-maturity Securities [Member] | P6 [Member]
Schedule of Investments [Line Items]
Type		Pooled
Class		Mezz
Original Cost		$ 1,223,000
Securities held-to-maturity, Amortized Cost		0
Securities held-to-maturity, Estimated Fair Value		0
Difference (1)	[1]	$ 0
Lowest Credit Rating		Caa1
Number of issuers currently performing | issuer		5
Actual deferrals/defaults (as a % of original dollar)		14.50%
Expected deferrals/defaults (as a % of remaining performing collateral)	[2]	0.00%
Excess Subordination as a Percentage of Current Performing Collateral (3)	[3]	0.00%
Held-to-maturity Securities [Member] | P7 [Member]
Schedule of Investments [Line Items]
Type		Pooled
Class		Mezz
Original Cost		$ 2,009,000
Securities held-to-maturity, Amortized Cost		0
Securities held-to-maturity, Estimated Fair Value		0
Difference (1)	[1]	$ 0
Lowest Credit Rating		Ca
Number of issuers currently performing | issuer		3
Actual deferrals/defaults (as a % of original dollar)		18.30%
Expected deferrals/defaults (as a % of remaining performing collateral)	[2]	0.00%
Excess Subordination as a Percentage of Current Performing Collateral (3)	[3]	0.00%
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		4,000,000
Securities held-to-maturity, Estimated Fair Value		4,000,000
Difference (1)	[1]	$ 0
Lowest Credit Rating		NR
Number of issuers currently performing | issuer		1
Actual deferrals/defaults (as a % of original dollar)		0.00%
Expected deferrals/defaults (as a % of remaining performing collateral)		0.00%

[1] The differences noted consist of unrealized gains (losses) recorded at September 30, 2015 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.