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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost and fair value of securities held to maturity |  |
Amortized Cost | $ 0 | $ 356,282
Gross Unrealized Gains | 0 | 8,576
Gross Unrealized Losses | 0 | (1,965)
Fair Value | 0 | 362,893
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities held to maturity |  |
Amortized Cost | 0 | 14,101
Gross Unrealized Gains | 0 | 4
Gross Unrealized Losses | 0 | (187)
Fair Value | 0 | 13,918
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities held to maturity |  |
Amortized Cost | 0 | 342,181
Gross Unrealized Gains | 0 | 8,572
Gross Unrealized Losses | 0 | (1,778)
Fair Value | $ 0 | $ 348,975

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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=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Fair value of 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 (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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