Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	$ 727	$ (87)	$ 1,394	$ 8,255
Cash flow hedges: Unrealized holding gains, Before Tax	33	44	92	229
Cash flow hedges: Unrealized holding gains, Tax Effect	(13)	(18)	(37)	(92)
Cash flow hedges: Unrealized holding gains, Net of Tax	20	26	55	137
Unrealized net actuarial gain (loss), Net of Tax	(1,616)	(687)	(2,452)	(650)
Other comprehensive income, Before tax amount	195	(573)	4,958	14,689
Other comprehensive income, Tax (expense) benefit	(77)	228	(1,976)	(5,873)
Other comprehensive income, Net	118	(345)	2,982	8,816
Investment securities- with OTTI [Member]
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount	1,658	748	6,682	6,149
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect	(661)	(300)	(2,665)	(2,460)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax	997	448	4,017	3,689
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income	139	170	479	501
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect	(55)	(68)	(191)	(200)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax	84	102	288	301
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount	1,519	578	6,203	5,648
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI: Net unrealized gains on investments with OTTI, Tax effect	(606)	(232)	(2,474)	(2,260)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax	913	346	3,729	3,388
Investment Securities -All Other AFS [Member]
Securities: Unrealized holding losses, Before tax	1,288	3	2,380	13,746
Securities: Unrealized holding losses, Tax effect	(515)	(2)	(949)	(5,496)
Securities: Unrealized holding losses, Net of tax	773	1	1,431	8,250
Securities: Less: gains recognized in income, Before tax	79	147	62	(7)
Securities: Less: gains recognized in income, Tax effect	(33)	(59)	(25)	2
Securities: gains recognized in income, Net of tax	46	88	37	(5)
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax	1,209	(144)	2,318	13,753
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect	(482)	57	(924)	(5,498)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax	727	(87)	1,394	8,255
Investment Securities HTM [Member]
Securities: Unrealized holding losses, Before tax	0	0	0	(3,984)
Securities: Unrealized holding losses, Tax effect	0	0	0	1,593
Securities: Unrealized holding losses, Net of tax	0	0	0	(2,391)
Securities: Less: gains recognized in income, Before tax	(106)	(95)	(374)	(127)
Securities: Less: gains recognized in income, Tax effect	42	38	149	51
Securities: gains recognized in income, Net of tax	(64)	(57)	(225)	(76)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax	106	95	374	(3,857)
Held to maturity securities: Net unrealized losses on all HTM securities, Tax	(42)	(38)	(149)	1,542
Held to maturity securities: Net unrealized losses on all HTM securities, After tax	64	57	225	(2,315)
Pension Plan [Member]
Unrealized net actuarial gain (loss), Before Tax	(2,892)	(1,233)	(4,651)	(1,345)
Unrealized net actuarial gain (loss), Tax Effect	1,153	494	1,856	539
Unrealized net actuarial gain (loss), Net of Tax	(1,739)	(739)	(2,795)	(806)
Net plan liability adjustment, Before Tax	(2,690)	(1,147)	(4,081)	(1,086)
Net plan liability adjustment, Tax Effect	1,074	460	1,629	436
Net plan liability adjustment, Net of Tax	(1,616)	(687)	(2,452)	(650)
SERP [Member]
Unrealized net actuarial gain (loss), Before Tax	0	0	0	0
Unrealized net actuarial gain (loss), Tax Effect	0	0	0	0
Unrealized net actuarial gain (loss), Net of Tax	0	0	0	0
Net plan liability adjustment, Before Tax	18	1	52	2
Net plan liability adjustment, Tax Effect	(8)	(1)	(21)	(1)
Net plan liability adjustment, Net of Tax	10	0	31	1
Amortization of unrecognized loss [Member] | Pension Plan [Member]
Less: amortization of unrecognized net gain (loss), Before Tax	(204)	(93)	(576)	(280)
Less: amortization of unrecognized net gain (loss), Tax Effect	80	37	229	112
Less: amortization of unrecognized net gain (loss), Net of Tax	(124)	(56)	(347)	(168)
Amortization of Unrecognized Gain [Member] | SERP [Member]
Less: amortization of unrecognized net gain (loss), Before Tax	(13)	4	(37)	13
Less: amortization of unrecognized net gain (loss), Tax Effect	5	(1)	15	(5)
Less: amortization of unrecognized net gain (loss), Net of Tax	(8)	3	(22)	8
Amortization of transition asset [Member] | Pension Plan [Member]
Less: amortization of transition asset, Before Tax	5	10	15	30
Less: amortization of transition asset, Tax Effect	(2)	(4)	(6)	(12)
Less: amortization of transition asset, Net of Tax	3	6	9	18
Amortization of prior service costs [Member] | Pension Plan [Member]
Less: amortization of prior service costs, Before Tax	(3)	(3)	(9)	(9)
Less: amortization of prior service costs, Tax Effect	1	1	4	3
Less: amortization of prior service costs, Net of Tax	(2)	(2)	(5)	(6)
Amortization of prior service costs [Member] | SERP [Member]
Less: amortization of prior service costs, Before Tax	(5)	(5)	(15)	(15)
Less: amortization of prior service costs, Tax Effect	3	2	6	6
Less: amortization of prior service costs, Net of Tax	$ (2)	$ (3)	$ (9)	$ (9)