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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (39) $ (460) $ 1,747 $ (207)
Cash flow hedges: Unrealized holding gains, Before Tax 7 261 (156) (799)
Cash flow hedges: Unrealized holding gains, Tax Effect (3) (104) 62 319
Cash flow hedges: Unrealized holding gains, Net of Tax 4 157 (94) (480)
Unrealized net actuarial gain (loss), Net of Tax 184 (266) 380 (561)
Other comprehensive income, Before tax amount 722 (574) 4,153 (719)
Other comprehensive income, Tax (expense) benefit (285) 229 (1,653) 287
Other comprehensive income, Net 437 (345) 2,500 (432)
Investment securities- with OTTI [Member]        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount 407 47 517 380
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect (162) (19) (204) (152)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax 245 28 313 228
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income 55 2 112 7
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (22) (1) (43) (3)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 33 1 69 4
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount 352 45 405 373
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect (140) (18) (161) (149)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax 212 27 244 224
Investment Securities -All Other AFS [Member]        
Securities: Unrealized holding losses, Before tax (95) (534) 2,859 115
Securities: Unrealized holding losses, Tax effect 44 213 (1,139) (46)
Securities: Unrealized holding losses, Net of tax (51) (321) 1,720 69
Securities: Less: gains recognized in income, Before tax (27) 232 (44) 460
Securities: Less: gains recognized in income, Tax effect 15 (93) 17 (184)
Securities: gains recognized in income, Net of tax (12) 139 (27) 276
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax (68) (766) 2,903 (345)
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect 29 306 (1,156) 138
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax (39) (460) 1,747 (207)
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 (90) (303) (262) (911)
Securities: Less: gains recognized in income, Tax effect 36 121 104 364
Securities: gains recognized in income, Net of tax (54) (182) (158) (547)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 90 303 262 911
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (36) (121) (104) (364)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 54 182 158 547
Pension Plan [Member]        
Unrealized net actuarial gain (loss), Before Tax 38 (657) (170) (1,578)
Unrealized net actuarial gain (loss), Tax Effect (14) 262 68 630
Unrealized net actuarial gain (loss), Net of Tax 24 (395) (102) (948)
Net plan liability adjustment, Before Tax 305 (442) 631 (933)
Net plan liability adjustment, Tax Effect (121) 176 (251) 372
Net plan liability adjustment, Net of Tax 184 (266) 380 (561)
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
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)    
Less: amortization of prior service costs, Before Tax   (5)    
Less: amortization of prior service costs, Tax Effect   3    
Less: amortization of prior service costs, Net of Tax   (2)    
Net plan liability adjustment, Before Tax 36 25 108 74
Net plan liability adjustment, Tax Effect (14) (10) (43) (29)
Net plan liability adjustment, Net of Tax 22 15 65 45
Amortization of unrecognized loss [Member] | Pension Plan [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (264) (212) (792) (636)
Less: amortization of unrecognized net gain (loss), Tax Effect 105 85 315 254
Less: amortization of unrecognized net gain (loss), Net of Tax (159) (127) (477) (382)
Amortization of unrecognized loss [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (37)      
Less: amortization of unrecognized net gain (loss), Tax Effect 14      
Less: amortization of unrecognized net gain (loss), Net of Tax (23)      
Amortization of Unrecognized Gain [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax     (110) (59)
Less: amortization of unrecognized net gain (loss), Tax Effect     44 24
Less: amortization of unrecognized net gain (loss), Net of Tax     (66) (35)
Amortization of transition asset [Member] | Pension Plan [Member]        
Less: amortization of transition asset, Before Tax 0 0 0 0
Less: amortization of transition asset, Tax Effect 0 0 0 0
Less: amortization of transition asset, Net of Tax 0 0 0 0
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 2 1 4 4
Less: amortization of prior service costs, Net of Tax (1) $ (2) (5) (5)
Amortization of prior service costs [Member] | SERP [Member]        
Less: amortization of prior service costs, Before Tax 1   2 (15)
Less: amortization of prior service costs, Tax Effect 0   (1) 5
Less: amortization of prior service costs, Net of Tax $ 1   $ 1 $ (10)