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Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense |  |  |  |  |  |  |  |  | $ (9,528) | $ (11,534) | $ (13,946)
Net Income | $ 10,980 | $ 12,639 | $ 11,097 | $ 11,813 | $ 11,621 | $ 9,660 | $ 9,839 | $ 9,556 | 46,529 | 40,676 | 35,184
Salaries and Employee Benefits |  |  |  |  |  |  |  |  | (51,306) | (46,642) | (43,961)
Total Reclassifications for the Period |  |  |  |  |  |  |  |  | 535 | 382 |
Unrealized Gains and Losses on Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Reclassifications for the Period |  |  |  |  |  |  |  |  | 558 | 387 |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Reclassifications for the Period |  |  |  |  |  |  |  |  | 535 | 382 | 1,282
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available-for-Sale Securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Gain (Loss) on Securities |  |  |  |  |  |  |  |  | 706 | 596 | 1,979
Income Tax Expense |  |  |  |  |  |  |  |  | (148) | (209) | (693)
Net Income |  |  |  |  |  |  |  |  | 558 | 387 | 1,286
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Post Retirement Plan Items Actuarial Gains (Losses) | Postretirement Medical and Life Benefit Plan |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense |  |  |  |  |  |  |  |  | 9 | 3 | 2
Net Income |  |  |  |  |  |  |  |  | (23) | (5) | (4)
Salaries and Employee Benefits |  |  |  |  |  |  |  |  | $ (32) | $ (8) | $ (6)

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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