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Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2009
Equity [Abstract] |  |  |  |  |  |  |
Deferred Gain Loss On Cash Flow Hedge |  | $ 78 |  | $ 78 |  | $ 137 | $ 1,400
COMPREHENSIVE INCOME |  |  |  |  |  |  |
Change in fair value of securities available for sale, pre tax amount |  | (2,533) | $ 1,277 | (9,773) | $ 2,173 |  |
Change in fair value of securities available for sale, tax (expense) benefit |  | 609 | (485) | 2,381 | (849) |  |
Change in fair value of securities available for sale, after tax amount |  | (1,924) | 792 | (7,392) | 1,324 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | 0 | 1 | 0 | 2 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 0 | (1) | 0 | (1) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0 | 0 | 0 | 1 |  |
Change in fair value of securities available for sale, pre tax amount |  | (2,533) | 1,276 | (9,773) | 2,171 |  |
Change in fair value of securities available for sale, tax (expense) benefit |  | 609 | (484) | 2,381 | (848) |  |
Change in fair value of securities available for sale, after tax amount |  | (1,924) | 792 | (7,392) | 1,323 |  |
Change in fair value of cash flow hedges, pre tax amount |  | 10 | (399) | 396 | (341) |  |
Change in fair value of cash flow hedges, tax (expense) benefit |  | (2) | 162 | (108) | 138 |  |
Change in fair value of cash flow hedges, after tax amount |  | 8 | (237) | 288 | (203) |  |
Less: net cash flow hedge losses reclassified into interest on borrowings expense, pre tax amount | [1] | 167 | (80) | 257 | (173) |  |
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit | [1] | (47) | 33 | (72) | 71 |  |
Less: net cash flow hedge losses reclassified into interest on borrowings expense, after tax | [1] | 120 | (47) | 185 | (102) |  |
Net change in fair value of cash flow hedges, pre tax amount |  | (157) | (319) | 139 | (168) |  |
Net change in fair value of cash flow hedges, tax (expense) benefit |  | 45 | 129 | (36) | 67 |  |
Net change in fair value of cash flow hedges |  | (112) | (190) | 103 | (101) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  |  | (7) |  | (14) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  |  | 3 |  | 6 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  |  | (4) |  | (8) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 93 | 69 | 187 | 139 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | (27) | (28) | (53) | (57) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | 66 | 41 | 134 | 82 |  |
Amortization of certain costs included in net periodic retirement costs, pre tax amount |  | 69 | 69 | 138 | 138 |  |
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit |  | (18) | (28) | (38) | (56) |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | 51 | 41 | 100 | 82 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [2] | 162 | 131 | 325 | 263 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | [2] | (45) | (53) | (91) | (107) |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | [2] | 117 | 78 | 234 | 156 |  |
Total other comprehensive income, pre tax amount |  | (2,528) | 1,088 | (9,309) | 2,266 |  |
Total other comprehensive income, tax (expense) benefit |  | 609 | (408) | 2,254 | (888) |  |
Total other comprehensive income, after tax amount |  | $ (1,919) | $ 680 | $ (7,055) | $ 1,378 |  |
[1] | Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million, net of tax, is being recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain has amortized to $78,000 and $137,000 at June 30, 2018 and December 31, 2017, respectively.
[2] | The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission.

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