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Fair Value Measurements (Change in Fair Value of Securities Using Level 3 Inputs) (Details) - Available-for-sale Securities [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	$ 0
Total net (losses) gains for the period included in OCI	(69)
Total net (losses) gains for the period included in net income	0
Purchases	0
Sales	0
Issuances	0
Settlements	0
Transfers into Level 3	16,419
Transfers out of Level 3	0
Fair value, September 30, 2019	16,350
Collateralized Loan Obligations and Other Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	7,409
Total net (losses) gains for the period included in OCI	(14)
Total net (losses) gains for the period included in net income	244
Purchases	18,404
Sales	0
Issuances	0
Settlements	(105)
Transfers into Level 3	13,603
Transfers out of Level 3	(19,662)
Fair value, September 30, 2019	19,879
Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, December 31, 2018	7,409
Total net (losses) gains for the period included in OCI	(83)
Total net (losses) gains for the period included in net income	244
Purchases	18,404
Sales	0
Issuances	0
Settlements	(105)
Transfers into Level 3	30,022
Transfers out of Level 3	(19,662)
Fair value, September 30, 2019	$ 36,229

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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