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Securities - Securities Sold (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | $ 495,192 |  |
Net Proceeds | 495,340 | $ 4,028 | $ 8,444
Gain/(Loss) | 148 |  |
Trust preferred securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 9,346 |  |
Net Proceeds | 9,403 |  |
Gain/(Loss) | 57 |  |
Other debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 7,269 |  |
Net Proceeds | 7,395 |  |
Gain/(Loss) | 126 |  |
Obligations of other U.S. Government agencies and corporations |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 11,088 |  |
Net Proceeds | 10,974 |  |
Gain/(Loss) | (114) |  |
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 110,019 |  |
Net Proceeds | 112,199 |  |
Gain/(Loss) | 2,180 |  |
Government agency mortgage backed securities | Residential mortgage backed securities: |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 264,924 |  |
Net Proceeds | 263,217 |  |
Gain/(Loss) | (1,707) |  |
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 14,104 |  |
Net Proceeds | 14,082 |  |
Gain/(Loss) | (22) |  |
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 72,153 |  |
Net Proceeds | 71,781 |  |
Gain/(Loss) | (372) |  |
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Carrying Value | 6,289 |  |
Net Proceeds | 6,289 |  |
Gain/(Loss) | $ 0 |  |

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26805-111562 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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