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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Debt securities: |  |
Amortized Cost | $ 487,631 |
Equity securities: |  |
Amortized Cost | 487,631 | $ 470,080
Gross Unrealized Gains | 23,346 | 9,406
Gross Unrealized Losses | (576) | (1,932)
Available-for-sale investment securities | 510,401 | 477,554
Held-to-maturity Securities, Debt Maturities [Abstract] |  |
Amortized Cost Basis | 0 | 31,712
Estimated Fair Value |  | 35,142
U.S. Government agencies |  |
Debt securities: |  |
Amortized Cost | 57,408 | 52,803
Gross Unrealized Gains | 574 | 315
Gross Unrealized Losses | (141) | (217)
Estimated Fair Value | 57,841 | 52,901
Obligations of states and political subdivisions |  |
Debt securities: |  |
Amortized Cost | 212,563 | 181,785
Gross Unrealized Gains | 17,810 | 6,779
Gross Unrealized Losses | (38) | (296)
Estimated Fair Value | 230,335 | 188,268
Held-to-maturity Securities, Debt Maturities [Abstract] |  |
Amortized Cost Basis |  | 31,712
Gross Unrealized Gains |  | 3,431
Gross Unrealized Losses |  | (1)
Estimated Fair Value |  | 35,142
U.S. Government agencies collateralized by residential mortgage obligations |  |
Debt securities: |  |
Amortized Cost | 208,082 | 225,636
Gross Unrealized Gains | 3,682 | 1,042
Gross Unrealized Losses | (397) | (1,419)
Estimated Fair Value | 211,367 | 225,259
Private label residential mortgage backed securities |  |
Debt securities: |  |
Amortized Cost | 2,078 | 2,356
Gross Unrealized Gains | 1,076 | 1,234
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 3,154 | 3,590
Other equity securities |  |
Equity securities: |  |
Amortized Cost | 7,500 | 7,500
Gross Unrealized Gains | 204 | 36
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 7,704 | $ 7,536

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