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Fair Value - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | $ 1,343,610 | $ 1,332,658
Equity securities, at fair value | 899 | 887
U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 280 | 289
Obligations of U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 475,745 | 485,898
Obligations of U.S. states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 87,778 | 85,440
U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 146,010 | 128,267
U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 631,328 | 630,558
Non-U.S. Government agencies or sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 19 | 31
U.S. corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 2,450 | 2,175
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 1,343,610 | 1,332,658
Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Treasuries | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Treasuries | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 280 | 289
Recurring | U.S. Treasuries | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Obligations of U.S. Government sponsored entities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Obligations of U.S. Government sponsored entities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 475,745 | 485,898
Recurring | Obligations of U.S. Government sponsored entities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 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] |  |
Available for sale debt securities, fair value | 0 | 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] |  |
Available for sale debt securities, fair value | 87,778 | 85,440
Recurring | Obligations of U.S. states and political subdivisions | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 146,010 | 128,267
Recurring | U.S. Government agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government sponsored entities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. Government sponsored entities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 631,328 | 630,558
Recurring | U.S. Government sponsored entities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 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] |  |
Available for sale debt securities, fair value | 0 | 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] |  |
Available for sale debt securities, fair value | 19 | 31
Recurring | Non-U.S. Government agencies or sponsored entities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. corporate debt securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | U.S. corporate debt securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 2,450 | 2,175
Recurring | U.S. corporate debt securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 0 | 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 | 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 | 0
Recurring | Equity securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | 899 | 887
Recurring | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 1,343,610 | 1,332,658
Recurring | Fair Value | U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 280 | 289
Recurring | Fair Value | Obligations of U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 475,745 | 485,898
Recurring | Fair Value | Obligations of U.S. states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 87,778 | 85,440
Recurring | Fair Value | U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 146,010 | 128,267
Recurring | Fair Value | U.S. Government sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 631,328 | 630,558
Recurring | Fair Value | Non-U.S. Government agencies or sponsored entities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 19 | 31
Recurring | Fair Value | U.S. corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale debt securities, fair value | 2,450 | 2,175
Recurring | Fair Value | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, at fair value | $ 899 | $ 887

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