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Investments (Fair Value and Gross Pre-Tax Net Unrealized Unrecognized Loss of Securities By Length of Time) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
AFS Fair Value, Less than 12 months $ 467,158 $ 1,358,111
AFS Unrealized Losses, Less than 12 months [1] (3,701) (15,651)
AFS Fair Value, 12 months or longer 7,533 15,626
AFS Unrealized Losses, 12 months or longer [1] (97) (406)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 474,691 1,373,737
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (3,798) (16,057)
AFS Fixed Income Securities [Member]    
AFS Fair Value, Less than 12 months 445,240 1,340,672
AFS Unrealized Losses, Less than 12 months [1] (2,341) (14,991)
AFS Fair Value, 12 months or longer 7,533 15,626
AFS Unrealized Losses, 12 months or longer [1] (97) (406)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 452,773 1,356,298
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (2,438) (15,397)
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]    
AFS Fair Value, Less than 12 months 19,058 6,419
AFS Unrealized Losses, Less than 12 months [1] (136) (36)
AFS Fair Value, 12 months or longer 250 0
AFS Unrealized Losses, 12 months or longer [1] (1) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 19,308 6,419
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (137) (36)
AFS Fixed Income Securities [Member] | Foreign Government [Member]    
AFS Fair Value, Less than 12 months   13,075
AFS Unrealized Losses, Less than 12 months [1]   (16)
AFS Fair Value, 12 months or longer   0
AFS Unrealized Losses, 12 months or longer [1]   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   13,075
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1]   (16)
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]    
AFS Fair Value, Less than 12 months 67,538 306,509
AFS Unrealized Losses, Less than 12 months [1] (432) (5,304)
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer [1] 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 67,538 306,509
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (432) (5,304)
AFS Fixed Income Securities [Member] | Corporate Securities [Member]    
AFS Fair Value, Less than 12 months 108,011 462,902
AFS Unrealized Losses, Less than 12 months [1] (827) (5,771)
AFS Fair Value, 12 months or longer 1,475 4,913
AFS Unrealized Losses, 12 months or longer [1] (18) (89)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 109,486 467,815
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (845) (5,860)
AFS Fixed Income Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
AFS Fair Value, Less than 12 months 88,636 189,795
AFS Unrealized Losses, Less than 12 months [1] (143) (354)
AFS Fair Value, 12 months or longer 0 319
AFS Unrealized Losses, 12 months or longer [1] 0 (1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 88,636 190,114
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (143) (355)
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]    
AFS Fair Value, Less than 12 months 65,016 82,492
AFS Unrealized Losses, Less than 12 months [1] (245) (1,021)
AFS Fair Value, 12 months or longer 5,216 1,645
AFS Unrealized Losses, 12 months or longer [1] (73) (7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 70,232 84,137
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (318) (1,028)
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]    
AFS Fair Value, Less than 12 months 96,981 279,480
AFS Unrealized Losses, Less than 12 months [1] (558) (2,489)
AFS Fair Value, 12 months or longer 592 8,749
AFS Unrealized Losses, 12 months or longer [1] (5) (309)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 97,573 288,229
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (563) (2,798)
Equity Securities [Member]    
AFS Fair Value, Less than 12 months 21,918 17,439
AFS Unrealized Losses, Less than 12 months [1] (1,360) (660)
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer [1] 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 21,918 17,439
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (1,360) (660)
Equity Securities [Member] | Common Stock [Member]    
AFS Fair Value, Less than 12 months 18,032 11,271
AFS Unrealized Losses, Less than 12 months [1] (1,342) (305)
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer [1] 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 18,032 11,271
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] (1,342) (305)
Equity Securities [Member] | Preferred Stock [Member]    
AFS Fair Value, Less than 12 months 3,886 6,168
AFS Unrealized Losses, Less than 12 months [1] (18) (355)
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer [1] 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,886 6,168
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] $ (18) $ (355)
[1] Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI.