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Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Amortized cost and fair value of securities held to maturity |  |
Amortized Cost | $ 356,282 | $ 458,400
Gross Unrealized Gains | 8,576 | 16,662
Gross Unrealized Losses | (1,965) | (1,309)
Fair Value | 362,893 | 473,753
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities held to maturity |  |
Amortized Cost | 14,101 | 101,155
Gross Unrealized Gains | 4 | 26
Gross Unrealized Losses | (187) | (1,214)
Fair Value | 13,918 | 99,967
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities held to maturity |  |
Amortized Cost | 342,181 | 357,245
Gross Unrealized Gains | 8,572 | 16,636
Gross Unrealized Losses | (1,778) | (95)
Fair Value | $ 348,975 | $ 373,786

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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