Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 15,763,000	$ 4,018,000
Total gains or (losses) (realized/unrealized), Included in earnings	59,000	20,000
Total gains or (losses) (realized/unrealized), Included in other comprehensive income (loss)	(1,097,000)	65,000
Purchases, issuances and settlements	1,940,000	(582,000)
Transfers in and/or (out) of Level 3	(7,887,000)	0
Ending balance	8,778,000	3,521,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total gains or (losses) (realized/unrealized), Included in earnings	2,000
Total gains or (losses) (realized/unrealized), Included in other comprehensive income (loss)	1,000
Purchases, issuances and settlements	1,940,000
Transfers in and/or (out) of Level 3	710,000
Ending balance	2,653,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Asset-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		3,533,000
Total gains or (losses) (realized/unrealized), Included in earnings		18,000
Total gains or (losses) (realized/unrealized), Included in other comprehensive income (loss)		65,000
Purchases, issuances and settlements		(572,000)
Ending balance		3,044,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	8,597,000
Transfers in and/or (out) of Level 3	(8,597,000)
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	7,166,000	481,000
Total gains or (losses) (realized/unrealized), Included in earnings	57,000	1,000
Total gains or (losses) (realized/unrealized), Included in other comprehensive income (loss)	(1,098,000)
Purchases, issuances and settlements		(9,000)
Ending balance	6,125,000	473,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Non-Agency Residential Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		4,000
Total gains or (losses) (realized/unrealized), Included in earnings		1,000
Purchases, issuances and settlements		(1,000)
Ending balance		4,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date