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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (665) $ (39) $ (1,973) $ 1,747
Cash flow hedges: Unrealized holding gains, Before Tax 153 7 908 (156)
Cash flow hedges: Unrealized holding gains, Tax Effect (41) (3) (245) 62
Cash flow hedges: Unrealized holding gains, Net of Tax 112 4 663 (94)
Unrealized net actuarial gain (loss), Net of Tax 575 184 (219) 380
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)    
Other comprehensive income, Before tax amount     760 4,135
Other comprehensive income, Tax (expense) benefit     (206) (1,653)
Other comprehensive income, Net     554 2,500
Investment securities- with OTTI [Member]        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount 410 407 2,842 517
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect (110) (162) (768) (204)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax 300 245 2,074 313
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income 53 55 160 112
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (14) (22) (43) (43)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 39 33 117 69
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount 357 352 2,537 405
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect (96) (140) (686) (161)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax 261 212 1,851 244
Investment Securities -All Other AFS [Member]        
Securities: Unrealized holding losses, Before tax (921) (95) (2,733) 2,859
Securities: Unrealized holding losses, Tax effect 249 44 739 (1,139)
Securities: Unrealized holding losses, Net of tax (672) (51) (1,994) 1,720
Securities: Less: gains recognized in income, Before tax (10) (27) (29) (44)
Securities: Less: gains recognized in income, Tax effect 3 15 8 17
Securities: gains recognized in income, Net of tax (7) (12) (21) (27)
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax (911) (68) (2,704) 2,903
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect 246 29 731 (1,156)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax (665) (39) (1,973) 1,747
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 (86) (90) (200) (262)
Securities: Less: gains recognized in income, Tax effect 23 36 54 104
Securities: gains recognized in income, Net of tax (63) (54) (146) (158)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 86 90 200 262
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (23) (36) (54) (104)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 63 54 146 158
Pension Plan [Member]        
Unrealized net actuarial gain (loss), Before Tax 486 38 (1,206) (170)
Unrealized net actuarial gain (loss), Tax Effect (132) (14) 326 68
Unrealized net actuarial gain (loss), Net of Tax 354 24 (880) (102)
Less: amortization of unrecognized net gain (loss), Before Tax (300) (264)    
Less: amortization of unrecognized net gain (loss), Tax Effect 82 105    
Less: amortization of unrecognized net gain (loss), Net of Tax (218) (159)    
Less: amortization of prior service costs, Before Tax (2) (3)    
Less: amortization of prior service costs, Tax Effect 0 2    
Less: amortization of prior service costs, Net of Tax (2) (1)    
Net plan liability adjustment, Before Tax 788 305 (300) 613
Net plan liability adjustment, Tax Effect (214) (121) 80 (251)
Net plan liability adjustment, Net of Tax 574 184 (220) 380
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 (40)      
Less: amortization of unrecognized net gain (loss), Tax Effect 11      
Less: amortization of unrecognized net gain (loss), Net of Tax (29)      
Less: amortization of prior service costs, Before Tax 1 1    
Less: amortization of prior service costs, Tax Effect (1) 0    
Less: amortization of prior service costs, Net of Tax 0 1    
Net plan liability adjustment, Before Tax 39 36 119 108
Net plan liability adjustment, Tax Effect (10) (14) (32) (43)
Net plan liability adjustment, Net of Tax 29 22 87 65
Other comprehensive income, Before tax amount 512 722    
Other comprehensive income, Tax (expense) benefit (138) (285)    
Other comprehensive income, Net $ 374 $ 437    
Amortization of unrecognized loss [Member] | Pension Plan [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax     (900) (792)
Less: amortization of unrecognized net gain (loss), Tax Effect     244 315
Less: amortization of unrecognized net gain (loss), Net of Tax     (656) (477)
Amortization of Unrecognized Gain [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax     (121) (110)
Less: amortization of unrecognized net gain (loss), Tax Effect     33 44
Less: amortization of unrecognized net gain (loss), Net of Tax     (88) (66)
Amortization of prior service costs [Member] | Pension Plan [Member]        
Less: amortization of prior service costs, Before Tax     (6) (9)
Less: amortization of prior service costs, Tax Effect     2 4
Less: amortization of prior service costs, Net of Tax     (4) (5)
Amortization of prior service costs [Member] | SERP [Member]        
Less: amortization of prior service costs, Before Tax     2 2
Less: amortization of prior service costs, Tax Effect     (1) (1)
Less: amortization of prior service costs, Net of Tax     $ 1 $ 1