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.