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Summary of Investments (Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-For-Sale, Amortized Cost |  |
Due in one year or less | $ 35,003 |
Due after one year through five years | 231,390 |
Due after five years through 10 years | 537,692 |
Due after 10 years | 655,884 |
Amortized Cost | 1,709,100 | $ 1,761,289
Available-For-Sale, Fair Value |  |
Due in one year or less | 35,183 |
Due after one year through five years | 234,309 |
Due after five years through 10 years | 547,933 |
Due after 10 years | 663,037 |
Available-for-sale securities, fair value | 1,730,563 | 1,749,488
Trading, Amortized Cost |  |
Due in one year or less | 4,572 |
Due after one year through five years | 6,292 |
Due after five years through 10 years | 0 |
Due after 10 years | 1,835 |
Amortized Cost | 12,699 | 11,277
Trading, Fair Value |  |
Due in one year or less | 5,582 |
Due after one year through five years | 8,406 |
Due after five years through 10 years | 0 |
Due after 10 years | 2,421 |
Fair Value | 16,409 | 13,240
Asset-backed securities |  |
Available-For-Sale, Amortized Cost |  |
Securities not categorized by contractual maturity | 3,274 |
Amortized Cost | 3,274 | 3,256
Available-For-Sale, Fair Value |  |
Securities not categorized by contractual maturity | 3,536 |
Available-for-sale securities, fair value | 3,536 | 3,495
Mortgage-backed securities |  |
Available-For-Sale, Amortized Cost |  |
Securities not categorized by contractual maturity | 7,401 |
Amortized Cost | 7,401 | 7,642
Available-For-Sale, Fair Value |  |
Securities not categorized by contractual maturity | 7,315 |
Available-for-sale securities, fair value | 7,315 | $ 7,424
Collateralized mortgage obligations |  |
Available-For-Sale, Amortized Cost |  |
Securities not categorized by contractual maturity | 238,456 |
Available-For-Sale, Fair Value |  |
Securities not categorized by contractual maturity | $ 239,250 |

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