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Fair Value - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 1,343,690 | $ 1,391,862
Equity securities, at fair value | 888 | 913
Available-for-sale securities, at fair value |  | 1,392,775
Obligations of U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 487,599 |
Available-for-sale securities, at fair value |  | 504,193
Obligations of U.S. states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 86,210 |
Available-for-sale securities, at fair value |  | 91,519
U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 119,876 |
Available-for-sale securities, at fair value |  | 137,735
U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 647,777 |
Available-for-sale securities, at fair value |  | 656,178
Non-U.S. Government agencies or sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 53 |
Available-for-sale securities, at fair value |  | 75
U.S. corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 2,175 |
Available-for-sale securities, at fair value |  | 2,162
Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, at fair value |  | 913
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities debt securities and equity securities at fair value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities debt securities and equity securities at fair value | 1,343,690 |
Available-for-sale securities, at fair value |  | 1,391,862
Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities debt securities and equity securities at fair value | 888 |
Available-for-sale securities, at fair value |  | 913
Recurring | Obligations of U.S. Government sponsored entities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Obligations of U.S. Government sponsored entities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 487,599 |
Available-for-sale securities, at fair value |  | 504,193
Recurring | Obligations of U.S. Government sponsored entities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Obligations of U.S. states and political subdivisions | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Obligations of U.S. states and political subdivisions | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 86,210 |
Available-for-sale securities, at fair value |  | 91,519
Recurring | Obligations of U.S. states and political subdivisions | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | U.S. Government agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | U.S. Government agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 119,876 |
Available-for-sale securities, at fair value |  | 137,735
Recurring | U.S. Government agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | U.S. Government sponsored entities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | U.S. Government sponsored entities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 647,777 |
Available-for-sale securities, at fair value |  | 656,178
Recurring | U.S. Government sponsored entities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Non-U.S. Government agencies or sponsored entities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Non-U.S. Government agencies or sponsored entities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 53 |
Available-for-sale securities, at fair value |  | 75
Recurring | Non-U.S. Government agencies or sponsored entities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | U.S. corporate debt securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | U.S. corporate debt securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 2,175 |
Available-for-sale securities, at fair value |  | 2,162
Recurring | U.S. corporate debt securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Equity securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Equity securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 0 |
Available-for-sale securities, at fair value |  | 0
Recurring | Equity securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 888 |
Available-for-sale securities, at fair value |  | 913
Recurring | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities debt securities and equity securities at fair value | 1,344,578 |
Available-for-sale securities, at fair value |  | 1,392,775
Recurring | Fair Value | Obligations of U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 487,599 |
Available-for-sale securities, at fair value |  | 504,193
Recurring | Fair Value | Obligations of U.S. states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 86,210 |
Available-for-sale securities, at fair value |  | 91,519
Recurring | Fair Value | U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 119,876 |
Available-for-sale securities, at fair value |  | 137,735
Recurring | Fair Value | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 647,777 |
Available-for-sale securities, at fair value |  | 656,178
Recurring | Fair Value | Non-U.S. Government agencies or sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 53 |
Available-for-sale securities, at fair value |  | 75
Recurring | Fair Value | U.S. corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 2,175 |
Available-for-sale securities, at fair value |  | 2,162
Recurring | Fair Value | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | $ 888 |
Available-for-sale securities, at fair value |  | $ 913

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