Accumulated Other Comprehensive Loss ("AOCL") (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest on investment securities: Taxable	$ 5,554	$ 5,611
Gain (loss) - other	29	526
Salaries and employee benefits	(22,391)	(20,595)
Tax (expense) benefit	(6,945)	(2,783)
Reclassification of certain tax effects	0
Net income	5,269	7,281
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	3,329	(920)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedge [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of certain tax effects	(101)
Net income	(101)
Parent Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (expense) benefit	(486)	(693)
Net income	5,269	7,281
Investment securities- with OTTI [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of certain tax effects	(481)
Investment securities- with OTTI [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest on investment securities: Taxable	166	9
Tax (expense) benefit	(45)	(4)
Reclassification of certain tax effects	481
Net income	602	5
Investment securities- all other [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain (loss) - other	(49)	440
Tax (expense) benefit	13	(175)
Reclassification of certain tax effects	435
Net income	399	265
Investment Securities HTM [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of certain tax effects	(246)
Investment Securities HTM [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest on investment securities: Taxable	(346)	(1,026)
Tax (expense) benefit	93	409
Reclassification of certain tax effects	246
Net income	(7)	(617)
Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of certain tax effects	(3,170)
Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (expense) benefit	(288)	343
Reclassification of certain tax effects	(3,170)
Net income	2,389	(517)
Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Unrecognized Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(1,057)	(848)
Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Transition Asset [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	0	0
Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Prior Service Costs [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(12)	(12)
SERP [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification of certain tax effects	(152)
SERP [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (expense) benefit	(38)	37
Reclassification of certain tax effects	(152)
Net income	47	(56)
SERP [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Unrecognized Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	(146)	(73)
SERP [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Prior Service Costs [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	$ 3	$ (20)