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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (460) $ 727 $ (207) $ 1,394
Cash flow hedges: Unrealized holding gains, Before Tax 261 33 (799) 92
Cash flow hedges: Unrealized holding gains, Tax Effect (104) (13) 319 (37)
Cash flow hedges: Unrealized holding gains, Net of Tax 157 20 (480) 55
Unrealized net actuarial gain (loss), Net of Tax (266) (1,616) (561) (2,452)
Other comprehensive income, Before tax amount (574) 195 (719) 4,958
Other comprehensive income, Tax (expense) benefit 229 (77) 287 (1,976)
Other comprehensive income, Net (345) 118 (432) 2,982
Investment securities- with OTTI [Member]        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount 47 1,658 380 6,682
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect (19) (661) (152) (2,665)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax 28 997 228 4,017
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income 2 139 7 479
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (1) (55) (3) (191)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 1 84 4 288
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount 45 1,519 373 6,203
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect (18) (606) (149) (2,474)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax 27 913 224 3,729
Investment Securities -All Other AFS [Member]        
Securities: Unrealized holding losses, Before tax (534) 1,288 115 2,380
Securities: Unrealized holding losses, Tax effect 213 (515) (46) (949)
Securities: Unrealized holding losses, Net of tax (321) 773 69 1,431
Securities: Less: gains recognized in income, Before tax 232 79 460 62
Securities: Less: gains recognized in income, Tax effect (93) (33) (184) (25)
Securities: gains recognized in income, Net of tax 139 46 276 37
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax (766) 1,209 (345) 2,318
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect 306 (482) 138 (924)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax (460) 727 (207) 1,394
Investment Securities HTM [Member]        
Securities: Unrealized holding losses, Before tax 0 0 0 0
Securities: Unrealized holding losses, Tax effect 0 0 0 0
Securities: Unrealized holding losses, Net of tax 0 0 0 0
Securities: Less: gains recognized in income, Before tax (303) (106) (911) (374)
Securities: Less: gains recognized in income, Tax effect 121 42 364 149
Securities: gains recognized in income, Net of tax (182) (64) (547) (225)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 303 106 911 374
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (121) (42) (364) (149)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 182 64 547 225
Pension Plan [Member]        
Unrealized net actuarial gain (loss), Before Tax (657) (2,892) (1,578) (4,651)
Unrealized net actuarial gain (loss), Tax Effect 262 1,153 630 1,856
Unrealized net actuarial gain (loss), Net of Tax (395) (1,739) (948) (2,795)
Net plan liability adjustment, Before Tax (442) (2,690) (933) (4,081)
Net plan liability adjustment, Tax Effect 176 1,074 372 1,629
Net plan liability adjustment, Net of Tax (266) (1,616) (561) (2,452)
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 25 18 74 52
Net plan liability adjustment, Tax Effect (10) (8) (29) (21)
Net plan liability adjustment, Net of Tax 15 10 45 31
Amortization of unrecognized loss [Member] | Pension Plan [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (212) (204) (636) (576)
Less: amortization of unrecognized net gain (loss), Tax Effect 85 80 254 229
Less: amortization of unrecognized net gain (loss), Net of Tax (127) (124) (382) (347)
Amortization of unrecognized loss [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (20)      
Less: amortization of unrecognized net gain (loss), Tax Effect 7      
Less: amortization of unrecognized net gain (loss), Net of Tax (13)      
Amortization of Unrecognized Gain [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax   (13) (59) (37)
Less: amortization of unrecognized net gain (loss), Tax Effect   5 24 15
Less: amortization of unrecognized net gain (loss), Net of Tax   (8) (35) (22)
Amortization of transition asset [Member] | Pension Plan [Member]        
Less: amortization of transition asset, Before Tax 0 5 0 15
Less: amortization of transition asset, Tax Effect 0 (2) 0 (6)
Less: amortization of transition asset, Net of Tax 0 3 0 9
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 4
Less: amortization of prior service costs, Net of Tax (2) (2) (5) (5)
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 3 5 6
Less: amortization of prior service costs, Net of Tax $ (2) $ (2) $ (10) $ (9)