Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	$ 679	$ 3,036
Cash flow hedges: Unrealized holding gains, Before Tax	35	92
Cash flow hedges: Unrealized holding gains, Tax Effect	(14)	(37)
Cash flow hedges: Unrealized holding gains, Net of Tax	21	55
Unrealized net actuarial gain (loss), Net of Tax	(90)	(127)
Other comprehensive income, Before tax amount	3,758	9,328
Other comprehensive income, Tax (expense) benefit	(1,498)	(3,729)
Other comprehensive income, Net	2,260	5,599
Investment securities- with OTTI [Member]
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount	2,778	4,549
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect	(1,108)	(1,819)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax	1,670	2,730
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income	167	160
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect	(67)	(64)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax	100	96
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount	2,611	4,389
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI: Net unrealized gains on investments with OTTI, Tax effect	(1,041)	(1,755)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax	1,570	2,634
Investment Securities -All Other AFS [Member]
Securities: Unrealized holding losses, Before tax	1,032	4,990
Securities: Unrealized holding losses, Tax effect	(411)	(1,995)
Securities: Unrealized holding losses, Net of tax	621	2,995
Securities: Less: gains recognized in income, Before tax	(97)	(68)
Securities: Less: gains recognized in income, Tax effect	39	27
Securities: gains recognized in income, Net of tax	(58)	(41)
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax	1,129	5,058
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect	(450)	(2,022)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	679	3,036
Investment Securities HTM [Member]
Securities: Unrealized holding losses, Before tax	0
Securities: Unrealized holding losses, Tax effect	0
Securities: Unrealized holding losses, Net of tax	0
Securities: Less: gains recognized in income, Before tax	(116)
Securities: Less: gains recognized in income, Tax effect	46
Securities: gains recognized in income, Net of tax	(70)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax	116
Held to maturity securities: Net unrealized losses on all HTM securities, Tax	(46)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax	70
Pension Plan [Member]
Unrealized net actuarial gain (loss), Before Tax	(334)	(298)
Unrealized net actuarial gain (loss), Tax Effect	132	119
Unrealized net actuarial gain (loss), Net of Tax	(202)	(179)
Net plan liability adjustment, Before Tax	(150)	(212)
Net plan liability adjustment, Tax Effect	60	85
Net plan liability adjustment, Net of Tax	(90)	(127)
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	17	1
Net plan liability adjustment, Tax Effect	(7)	0
Net plan liability adjustment, Net of Tax	10	1
Amortization of Unrecognized Loss [Member] | Pension Plan [Member]
Less: amortization of unrecognized net gain (loss), Before Tax	(186)	(93)
Less: amortization of unrecognized net gain (loss), Tax Effect	74	37
Less: amortization of unrecognized net gain (loss), Net of Tax	(112)	(56)
Amortization of Unrecognized Loss [Member] | SERP [Member]
Less: amortization of unrecognized net gain (loss), Before Tax		4
Less: amortization of unrecognized net gain (loss), Tax Effect		(1)
Less: amortization of unrecognized net gain (loss), Net of Tax		3
Amortization of Unrecognized Gain [Member] | SERP [Member]
Less: amortization of unrecognized net gain (loss), Before Tax	(12)
Less: amortization of unrecognized net gain (loss), Tax Effect	5
Less: amortization of unrecognized net gain (loss), Net of Tax	(7)
Amortization of Transition Asset [Member] | Pension Plan [Member]
Less: amortization of transition asset, Before Tax	5	10
Less: amortization of transition asset, Tax Effect	(2)	(4)
Less: amortization of transition asset, Net of Tax	3	6
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	1
Less: amortization of prior service costs, Net of Tax	(3)	(2)
Amortization of Prior Service Costs [Member] | SERP [Member]
Less: amortization of prior service costs, Before Tax	(5)	(5)
Less: amortization of prior service costs, Tax Effect	2	1
Less: amortization of prior service costs, Net of Tax	$ (3)	$ (4)