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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Schedule of Comprehensive Income [Line Items] |  |  |
Other comprehensive income, before reclassifications, net of tax | [1] | $ 2,437 | $ 745
Reclassification from Accumulated Other Comprehensive Income, net of tax | [1] | 99 | 165
Other Comprehensive Income, before Tax |  | 4,173 | 1,494
Other Comprehensive Income, Tax |  | (1,637) | (584)
Other Comprehensive Income | [1] | 2,536 | 910
Unrealized Gains and Losses on Available for Sale Securities [Member] |  |  |
Schedule of Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income Loss Before Reclassifications Before Tax |  | 4,010 | 1,225
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit |  | (1,573) | (480)
Other comprehensive income, before reclassifications, net of tax |  | 2,437 | 745
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  |  | 90
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  |  | (35)
Reclassification from Accumulated Other Comprehensive Income, net of tax |  | 0 | 55
Other Comprehensive Income | [1] | 2,437 | 800
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
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  | 166 | 192
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  | (65) | (75)
Reclassification from Accumulated Other Comprehensive Income, net of tax |  | 101 | 117
Other Comprehensive Income | [1] | 101 | 117
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
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax |  | (3) | (13)
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit |  | 1 | 6
Reclassification from Accumulated Other Comprehensive Income, net of tax |  | (2) | (7)
Other Comprehensive Income | [1] | $ (2) | $ (7)
[1] | All amounts are net of tax. Amounts in parentheses indicate debits.

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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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