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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt securities: |  |
Amortized Cost | $ 490,513 |
Available-for-sale debt securities | 484,001 | $ 535,281
Equity securities: |  |
Equity securities | 7,254 | 7,423
Amortized Cost | 490,513 | 531,192
Gross Unrealized Gains | 4,096 | 8,432
Gross Unrealized Losses | (10,608) | (4,343)
Available-for-sale securities | 484,001 | 535,281
U.S. Treasury securities |  |
Debt securities: |  |
Amortized Cost | 32,741 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (49) |
Available-for-sale debt securities | 32,692 |
U.S. Government agencies |  |
Debt securities: |  |
Amortized Cost | 7,228 | 65,994
Gross Unrealized Gains | 0 | 667
Gross Unrealized Losses | (125) | (74)
Available-for-sale debt securities | 7,103 | 66,587
Obligations of states and political subdivisions |  |
Debt securities: |  |
Amortized Cost | 130,743 | 136,955
Gross Unrealized Gains | 3,093 | 6,240
Gross Unrealized Losses | (828) | (90)
Available-for-sale debt securities | 133,008 | 143,105
U.S. Government agencies collateralized by residential mortgage obligations |  |
Debt securities: |  |
Amortized Cost | 227,027 | 237,210
Gross Unrealized Gains | 203 | 601
Gross Unrealized Losses | (5,637) | (2,903)
Available-for-sale debt securities | 221,593 | 234,908
Private label mortgage and asset backed securities |  |
Debt securities: |  |
Amortized Cost | 92,774 | 91,033
Gross Unrealized Gains | 800 | 924
Gross Unrealized Losses | (3,969) | (1,276)
Available-for-sale debt securities | $ 89,605 | 90,681
Other equity securities |  |
Equity securities: |  |
Equity securities |  | $ 7,500

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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