Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,308,056	$ 1,293,853
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	143,028	85,661
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	6,505	1,555
Debt Securities, Available-for-sale	1,444,579	1,377,959
US Treasury Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,549	9,709
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,960	1,638
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	11,509	11,347
US Government Agencies Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,497	3,516
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,358	1,015
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	4,855	4,531
US States and Political Subdivisions Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	401,852	512,239
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	31,926	24,285
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,059	240
Debt Securities, Available-for-sale	432,719	536,284
Corporate Debt Securities Financial Sector Member [Domain]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	205,453	169,146
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	23,735	13,094
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	478	135
Debt Securities, Available-for-sale	228,710	182,105
Corporate Debt Security Consumer Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	176,020	148,575
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	21,911	12,591
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,414	464
Debt Securities, Available-for-sale	196,517	160,702
Corporate Debt Security Energy Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	81,326	74,315
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,525	4,765
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,191	115
Debt Securities, Available-for-sale	83,660	78,965
Corporate Debt Security All Other Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	265,948	212,714
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	33,708	16,022
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	618	420
Debt Securities, Available-for-sale	299,038	228,316
Commercial Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	225	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	4	5
Debt Securities, Available-for-sale	221	1,100
Residential Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	118,088	118,130
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	23,699	12,223
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	66
Debt Securities, Available-for-sale	141,787	130,287
Asset-backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	45,996	44,302
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	189	11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	741	110
Debt Securities, Available-for-sale	45,444	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	17	17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	$ 119	$ 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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