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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt securities: |  |
Amortized Cost | $ 488,425 |
Equity securities: |  |
Amortized Cost | 488,425 | $ 470,080
Gross Unrealized Gains | 14,367 | 9,406
Gross Unrealized Losses | (814) | (1,932)
Available-for-sale investment securities | 501,978 | 477,554
Held-to-maturity Securities, Debt Maturities [Abstract] |  |
Amortized Cost Basis | 0 | 31,712
Estimated Fair Value |  | 35,096
U.S. Government agencies |  |
Debt securities: |  |
Amortized Cost | 51,194 | 52,803
Gross Unrealized Gains | 499 | 315
Gross Unrealized Losses | (135) | (217)
Estimated Fair Value | 51,558 | 52,901
Obligations of states and political subdivisions |  |
Debt securities: |  |
Amortized Cost | 204,242 | 181,785
Gross Unrealized Gains | 10,611 | 6,779
Gross Unrealized Losses | (96) | (296)
Estimated Fair Value | 214,757 | 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 | 223,234 | 225,636
Gross Unrealized Gains | 1,990 | 1,042
Gross Unrealized Losses | (583) | (1,419)
Estimated Fair Value | 224,641 | 225,259
Private label residential mortgage backed securities |  |
Debt securities: |  |
Amortized Cost | 2,255 | 2,356
Gross Unrealized Gains | 1,119 | 1,234
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 3,374 | 3,590
Other equity securities |  |
Equity securities: |  |
Amortized Cost | 7,500 | 7,500
Gross Unrealized Gains | 148 | 36
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 7,648 | $ 7,536

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