Fair Value of Financial Instruments (Level 3 Securities) (Details) - Recurring - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2016	Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		$ 15,553	$ 16,252
Net unrealized gains (losses)	[1]	178	400
Disposals		(486)	(1,539)
Purchases			132
Ending Balance		15,245	15,245
States, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		254	343
Net unrealized gains (losses)	[1]	0	(9)
Disposals		0	(80)
Purchases			0
Ending Balance		254	254
Corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		10,500	10,895
Net unrealized gains (losses)	[1]	156	318
Disposals		(329)	(886)
Purchases			0
Ending Balance		10,327	10,327
Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		807	1,036
Net unrealized gains (losses)	[1]	22	91
Disposals		(157)	(455)
Purchases			0
Ending Balance		672	672
Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		3,992	3,978
Net unrealized gains (losses)	[1]	0	0
Disposals		0	(118)
Purchases			132
Ending Balance		$ 3,992	$ 3,992

[1] Unrealized gains (losses) are recorded as a component of comprehensive income.