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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt securities: |  |
Amortized Cost | $ 507,477 |
Equity securities: |  |
Amortized Cost | 507,477 | $ 548,640
Gross Unrealized Gains | 10,931 | 7,871
Gross Unrealized Losses | (3,331) | (8,762)
Available-for-sale securities | 515,077 | 547,749
U.S. Government agencies |  |
Debt securities: |  |
Amortized Cost | 61,253 | 69,005
Gross Unrealized Gains | 598 | 242
Gross Unrealized Losses | (47) | (277)
Estimated Fair Value | 61,804 | 68,970
Obligations of states and political subdivisions |  |
Debt securities: |  |
Amortized Cost | 204,841 | 288,543
Gross Unrealized Gains | 8,660 | 6,109
Gross Unrealized Losses | (516) | (4,353)
Estimated Fair Value | 212,985 | 290,299
U.S. Government agencies collateralized by residential mortgage obligations |  |
Debt securities: |  |
Amortized Cost | 190,028 | 181,785
Gross Unrealized Gains | 696 | 484
Gross Unrealized Losses | (2,375) | (4,048)
Estimated Fair Value | 188,349 | 178,221
Private label mortgage backed securities |  |
Debt securities: |  |
Amortized Cost | 43,855 | 1,807
Gross Unrealized Gains | 977 | 1,036
Gross Unrealized Losses | (379) | 0
Estimated Fair Value | 44,453 | 2,843
Other equity securities |  |
Equity securities: |  |
Amortized Cost | 7,500 | 7,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14) | (84)
Estimated Fair Value | $ 7,486 | $ 7,416

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