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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt securities: |  |
Amortized Cost | $ 520,905 |
Equity securities: |  |
Amortized Cost | 520,905 | $ 548,640
Gross Unrealized Gains | 10,755 | 7,871
Gross Unrealized Losses | (3,533) | (8,762)
Available-for-sale securities | 528,127 | 547,749
U.S. Government agencies |  |
Debt securities: |  |
Amortized Cost | 63,921 | 69,005
Gross Unrealized Gains | 531 | 242
Gross Unrealized Losses | (31) | (277)
Estimated Fair Value | 64,421 | 68,970
Obligations of states and political subdivisions |  |
Debt securities: |  |
Amortized Cost | 217,112 | 288,543
Gross Unrealized Gains | 8,506 | 6,109
Gross Unrealized Losses | (608) | (4,353)
Estimated Fair Value | 225,010 | 290,299
U.S. Government agencies collateralized by residential mortgage obligations |  |
Debt securities: |  |
Amortized Cost | 193,644 | 181,785
Gross Unrealized Gains | 696 | 484
Gross Unrealized Losses | (2,437) | (4,048)
Estimated Fair Value | 191,903 | 178,221
Private label mortgage backed securities |  |
Debt securities: |  |
Amortized Cost | 38,728 | 1,807
Gross Unrealized Gains | 1,022 | 1,036
Gross Unrealized Losses | (436) | 0
Estimated Fair Value | 39,314 | 2,843
Other equity securities |  |
Equity securities: |  |
Amortized Cost | 7,500 | 7,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (21) | (84)
Estimated Fair Value | $ 7,479 | $ 7,416

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