Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	$ 78	$ 434
Cash flow hedges: Unrealized holding gains, Before Tax	86	(551)
Cash flow hedges: Unrealized holding gains, Tax Effect	(34)	220
Cash flow hedges: Unrealized holding gains, Net of Tax	52	(331)
Unrealized net actuarial gain (loss), Net of Tax	194	(213)
Other comprehensive income, Before tax amount	838	(1,455)
Other comprehensive income, Tax (expense) benefit	(333)	582
Other comprehensive income, Net	505	(873)
Investment securities- with OTTI [Member]
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount	166	(1,496)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect	(66)	597
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax	100	(899)
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income	2	36
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect	0	(14)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax	2	22
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount	164	(1,532)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect	(66)	611
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax	98	(921)
Investment Securities -All Other AFS [Member]
Securities: Unrealized holding losses, Before tax	122	929
Securities: Unrealized holding losses, Tax effect	(49)	(371)
Securities: Unrealized holding losses, Net of tax	73	558
Securities: Less: gains recognized in income, Before tax	(9)	206
Securities: Less: gains recognized in income, Tax effect	4	(82)
Securities: gains recognized in income, Net of tax	(5)	124
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax	131	723
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect	(53)	(289)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	78	434
Investment Securities HTM [Member]
Securities: Unrealized holding losses, Before tax	0	0
Securities: Unrealized holding losses, Tax effect	0	0
Securities: Unrealized holding losses, Net of tax	0	0
Securities: Less: gains recognized in income, Before tax	(101)	(237)
Securities: Less: gains recognized in income, Tax effect	40	94
Securities: gains recognized in income, Net of tax	(61)	(143)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax	101	237
Held to maturity securities: Net unrealized losses on all HTM securities, Tax	(40)	(94)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax	61	143
Pension Plan [Member]
Unrealized net actuarial gain (loss), Before Tax	53	(571)
Unrealized net actuarial gain (loss), Tax Effect	(21)	228
Unrealized net actuarial gain (loss), Net of Tax	32	(343)
Net plan liability adjustment, Before Tax	320	(356)
Net plan liability adjustment, Tax Effect	(126)	143
Net plan liability adjustment, Net of Tax	194	(213)
SERP [Member]
Unrealized net actuarial gain (loss), Before Tax	0	0
Unrealized net actuarial gain (loss), Tax Effect	0	0
Unrealized net actuarial gain (loss), Net of Tax	0	0
Net plan liability adjustment, Before Tax	36	24
Net plan liability adjustment, Tax Effect	(14)	(9)
Net plan liability adjustment, Net of Tax	22	15
Amortization of unrecognized loss [Member] | Pension Plan [Member]
Less: amortization of unrecognized net gain (loss), Before Tax	(264)	(212)
Less: amortization of unrecognized net gain (loss), Tax Effect	105	85
Less: amortization of unrecognized net gain (loss), Net of Tax	(159)	(127)
Amortization of Unrecognized Gain [Member] | SERP [Member]
Less: amortization of unrecognized net gain (loss), Before Tax	(37)	(19)
Less: amortization of unrecognized net gain (loss), Tax Effect	14	8
Less: amortization of unrecognized net gain (loss), Net of Tax	(23)	(11)
Amortization of transition asset [Member] | Pension Plan [Member]
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
Amortization of prior service costs [Member] | Pension Plan [Member]
Less: amortization of prior service costs, Before Tax	(3)	(3)
Less: amortization of prior service costs, Tax Effect	0	0
Less: amortization of prior service costs, Net of Tax	(3)	(3)
Amortization of prior service costs [Member] | SERP [Member]
Less: amortization of prior service costs, Before Tax	1	(5)
Less: amortization of prior service costs, Tax Effect	0	1
Less: amortization of prior service costs, Net of Tax	$ 1	$ (4)