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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Other comprehensive income, before reclassifications, net of tax | [1] | $ (810) |  | $ 543 |  | $ 2,309 |  | $ 384 |
Reclassification from Accumulated Other Comprehensive Income, net of tax | [1] | 110 |  | 108 |  | 221 |  | 262 |
Other Comprehensive Income, before Tax |  | (1,086) |  | 1,071 |  | 4,220 |  | 1,063 |
Other Comprehensive Income, Tax |  | 386 |  | (420) |  | (1,690) |  | (417) |
Other Comprehensive Income | [1],[2] | (700) |  | 651 |  | 2,530 |  | 646 |
Unrealized Gains and Losses on Available for Sale Securities [Member] |  |  |  |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Other Comprehensive Income Loss Before Reclassifications Before Tax |  | (1,264) |  | 892 |  | 3,868 |  | 631 |
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit |  | 454 |  | (349) |  | (1,559) |  | (247) |
Other comprehensive income, before reclassifications, net of tax |  | (810) | [1] | 543 | [1] | 2,309 | [2] | 384 | [1]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  | 0 |  | 0 |  | (144) |  | (106) |
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  | 0 |  | 0 |  | 56 |  | 41 |
Reclassification from Accumulated Other Comprehensive Income, net of tax |  | 0 | [1] | 0 | [1] | (88) | [2] | (65) | [1]
Other Comprehensive Income | [1] | (810) |  | 543 |  | 2,221 |  | 319 |
Amortization of Net Retirement Plan Actuarial Loss [Member] |  |  |  |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Other comprehensive income, before reclassifications, net of tax | [1] | 0 |  | 0 |  | 0 |  | 0 |
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  | 181 |  | 192 |  | 503 |  | 579 |
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  | (70) |  | (75) |  | (189) |  | (227) |
Reclassification from Accumulated Other Comprehensive Income, net of tax |  | 111 | [1] | 117 | [1] | 314 | [2] | 352 | [1]
Other Comprehensive Income | [1] | 111 |  | 117 |  | 314 |  | 352 |
Accretion of Net Retirement Plan Prior Service Credit [Member] |  |  |  |  |  |  |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Other comprehensive income, before reclassifications, net of tax | [1] | 0 |  | 0 |  | 0 |  | 0 |
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  | (3) |  | (13) |  | (7) |  | (41) |
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  | 2 |  | 4 |  | 2 |  | 16 |
Reclassification from Accumulated Other Comprehensive Income, net of tax |  | (1) | [1] | (9) | [1] | (5) | [2] | (25) | [1]
Other Comprehensive Income | [1] | $ (1) |  | $ (9) |  | $ (5) |  | $ (25) |
[1] | All amounts are net of tax. Amounts in parentheses indicate debits.
[2] | These accumulated other comprehensive income components are included in the computation of net periodic pension cost.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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