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Investments - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt securities: |  |
Amortized Cost | $ 445,098 |
Available-for-sale debt securities | 434,697 | $ 535,281
Amortized Cost | 445,098 | 531,192
Gross Unrealized Gains | 2,564 | 8,432
Gross Unrealized Losses | (12,965) | (4,343)
Available-for-sale securities | 434,697 | 535,281
U.S. Government agencies |  |
Debt securities: |  |
Amortized Cost | 22,728 | 65,994
Gross Unrealized Gains | 0 | 667
Gross Unrealized Losses | (485) | (74)
Available-for-sale debt securities | 22,243 | 66,587
Obligations of states and political subdivisions |  |
Debt securities: |  |
Amortized Cost | 65,839 | 136,955
Gross Unrealized Gains | 1,566 | 6,240
Gross Unrealized Losses | (1,291) | (90)
Available-for-sale debt securities | 66,114 | 143,105
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Debt securities: |  |
Amortized Cost | 250,331 | 237,210
Gross Unrealized Gains | 249 | 601
Gross Unrealized Losses | (6,632) | (2,903)
Available-for-sale debt securities | 243,948 | 234,908
Private label mortgage and asset backed securities |  |
Debt securities: |  |
Amortized Cost | 106,200 | 91,033
Gross Unrealized Gains | 749 | 924
Gross Unrealized Losses | (4,557) | (1,276)
Available-for-sale debt securities | $ 102,392 | $ 90,681

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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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