Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,295,628	$ 1,293,853
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	129,000	85,661
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	7,311	1,555
Debt Securities, Available-for-sale	1,417,317	1,377,959
US Treasury Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,570	9,709
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,070	1,638
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	11,640	11,347
US Government Agencies Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,503	3,516
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,378	1,015
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	4,881	4,531
US States and Political Subdivisions Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	427,529	512,239
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	28,965	24,285
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	675	240
Debt Securities, Available-for-sale	455,819	536,284
Corporate Debt Securities Financial Sector Member [Domain]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	193,818	169,146
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	20,018	13,094
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	555	135
Debt Securities, Available-for-sale	213,281	182,105
Corporate Debt Security Consumer Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	157,302	148,575
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	20,113	12,591
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,450	464
Debt Securities, Available-for-sale	175,965	160,702
Corporate Debt Security Energy Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	81,201	74,315
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,854	4,765
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,904	115
Debt Securities, Available-for-sale	84,151	78,965
Corporate Debt Security All Other Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	255,584	212,714
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	27,951	16,022
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,048	420
Debt Securities, Available-for-sale	282,487	228,316
Commercial Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	278	1,105
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	7	5
Debt Securities, Available-for-sale	271	1,100
Residential Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	118,250	118,130
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	23,467	12,223
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	66
Debt Securities, Available-for-sale	141,717	130,287
Asset-backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	48,491	44,302
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	165	11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,672	110
Debt Securities, Available-for-sale	46,984	44,203
Foreign Government, Non-US [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	102	102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	19	17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	$ 121	$ 119

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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