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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt securities: |  |
Amortized Cost | $ 526,678 |
Equity securities: |  |
Amortized Cost | 526,678 | $ 548,640
Gross Unrealized Gains | 8,792 | 7,871
Gross Unrealized Losses | (6,230) | (8,762)
Available-for-sale securities | 529,240 | 547,749
U.S. Government agencies |  |
Debt securities: |  |
Amortized Cost | 66,472 | 69,005
Gross Unrealized Gains | 258 | 242
Gross Unrealized Losses | (192) | (277)
Estimated Fair Value | 66,538 | 68,970
Obligations of states and political subdivisions |  |
Debt securities: |  |
Amortized Cost | 265,764 | 288,543
Gross Unrealized Gains | 7,017 | 6,109
Gross Unrealized Losses | (2,846) | (4,353)
Estimated Fair Value | 269,935 | 290,299
U.S. Government agencies collateralized by residential mortgage obligations |  |
Debt securities: |  |
Amortized Cost | 185,219 | 181,785
Gross Unrealized Gains | 532 | 484
Gross Unrealized Losses | (3,108) | (4,048)
Estimated Fair Value | 182,643 | 178,221
Private label residential mortgage backed securities |  |
Debt securities: |  |
Amortized Cost | 1,723 | 1,807
Gross Unrealized Gains | 985 | 1,036
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2,708 | 2,843
Other equity securities |  |
Equity securities: |  |
Amortized Cost | 7,500 | 7,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (84) | (84)
Estimated Fair Value | $ 7,416 | $ 7,416

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