Accumulated Other Comprehensive Loss ("AOCL") (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	$ 674	$ (1,194)
Cash flow hedges: Unrealized holding gains, Before Tax	81	766
Cash flow hedges: Unrealized holding gains, Tax Effect	(22)	(305)
Cash flow hedges: Unrealized holding gains, Net of Tax	59	461
Unrealized net actuarial gain (loss), Net of Tax	336	(1,569)
Other Comprehensive Income, Before Tax Amount	1,717	(4,192)
Other Comprehensive Income, Tax (Expense) Benefit	(462)	1,671
Other Comprehensive Income, Net	1,255	(2,521)
Investment securities- with OTTI [Member]
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before Tax Amount	42	(700)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, tax effect	(11)	279
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of Tax	31	(421)
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Before Tax Amount	166	9
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax Effect	(45)	(4)
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Net of Tax	121	5
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI: Net unrealized gains on investments with OTTI, Tax Effect	34	283
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before Tax Amount	(124)	(709)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of Tax	(90)	(426)
Investment Securities -All Other AFS [Member]
Securities: Unrealized holding gains (losses), Before Tax	874	(1,545)
Securities: Unrealized holding gains (losses), Tax Effect	(236)	616
Securities: Unrealized holding gains (losses), Net of Tax	638	(929)
Securities: Less: gains (losses) recognized in income, Before Tax	(49)	440
Securities: Less: gains (losses) recognized in income, Tax Effect	13	(175)
Securities: Less: gains (losses) recognized in income, Net of Tax	(36)	265
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Before Tax	923	(1,985)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Tax Effect	(249)	791
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	674	(1,194)
Investment Securities HTM [Member]
Securities: Unrealized holding gains (losses), Before Tax	0	0
Securities: Unrealized holding gains (losses), Tax Effect	0	0
Securities: Unrealized holding gains (losses), Net of Tax	0	0
Securities: Less: gains (losses) recognized in income, Before Tax	(346)	(1,026)
Securities: Less: gains (losses) recognized in income, Tax Effect	93	409
Securities: Less: gains (losses) recognized in income, Net of Tax	(253)	(617)
Held to maturity securities: Net unrealized gains (losses) on all HTM securities, Before tax	346	1,026
Held to maturity securities: Net unrealized gains (losses) on all HTM securities, Tax	(93)	(409)
Held to maturity securities: Net unrealized gains (losses) on all HTM securities, After tax	253	617
Pension Plan [Member]
Unrealized net actuarial gain (loss), Before Tax	(609)	(3,468)
Unrealized net actuarial gain (loss), Tax Effect	164	1,382
Unrealized net actuarial gain (loss), Net of Tax	(445)	(2,086)
Less: amortization of unrecognized net gain (loss), Before Tax	(1,057)	(848)
Less: amortization of unrecognized net gain (loss), Tax Effect	285	338
Less: amortization of unrecognized net gain (loss), Net of Tax	(772)	(510)
Less: amortization of transition asset, Before Tax	0	0
Less: amortization of transition asset, Tax Effect	0	0
Less: amortization of transition asset, Net of Tax	0	0
Less: amortization of prior service costs, Before Tax	(12)	(12)
Less: amortization of prior service costs, Tax Effect	3	5
Less: amortization of prior service costs, Net of Tax	(9)	(7)
Net plan liability adjustment, Before Tax	460	(2,608)
Net plan liability adjustment, Tax Effect	(124)	1,039
Net plan liability adjustment, Net of Tax	336	(1,569)
SERP [Member]
Unrealized net actuarial gain (loss), Before Tax	(112)	(775)
Unrealized net actuarial gain (loss), Tax Effect	30	309
Unrealized net actuarial gain (loss), Net of Tax	(82)	(466)
Less: amortization of unrecognized net gain (loss), Before Tax	(146)	(73)
Less: amortization of unrecognized net gain (loss), Tax Effect	39	29
Less: amortization of unrecognized net gain (loss), Net of Tax	(107)	(44)
Less: amortization of prior service costs, Before Tax	3	(20)
Less: amortization of prior service costs, Tax Effect	(1)	8
Less: amortization of prior service costs, Net of Tax	2	(12)
Net plan liability adjustment, Before Tax	31	(682)
Net plan liability adjustment, Tax Effect	(8)	272
Net plan liability adjustment, Net of Tax	23	(410)
Parent Company [Member]
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Before Tax	594	(795)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Tax Effect	(137)	317
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	$ 457	$ (478)