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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ 402 $ (665) $ 2,884 $ (1,973)
Cash flow hedges: Unrealized holding gains, Before Tax (329) 153 (1,427) 908
Cash flow hedges: Unrealized holding gains, Tax Effect 90 (41) 387 (245)
Cash flow hedges: Unrealized holding gains, Net of Tax (239) 112 (1,040) 663
Unrealized net actuarial loss, Net of Tax 121 575 2,957 (219)
Other comprehensive income, Before tax amount (678) 512 5,364 760
Other comprehensive income, Tax (expense) benefit 185 (138) (1,454) (206)
Other comprehensive income, Net (493) 374 3,910 554
Investment securities- with OTTI AFS [Member]        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount (1,126) 410 (1,401) 2,842
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect 306 (110) 380 (768)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax (820) 300 (1,021) 2,074
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Before tax amount 50 53 149 160
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (13) (14) (39) (43)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 37 39 110 117
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount (1,176) 357 (1,550) 2,537
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect 319 (96) 419 (686)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax (857) 261 (1,131) 1,851
Securities: Less: gain (losses) recognized in income, Before tax       145
Securities: Less: gain (losses) recognized in income, Tax effect       (39)
Securities: gains (losses) recognized in income, Net of tax       106
Investment Securities -All Other AFS [Member]        
Securities: Unrealized holding losses, Before tax 552 (921) 3,957 (2,733)
Securities: Unrealized holding losses, Tax effect (149) 249 (1,072) 739
Securities: Unrealized holding losses, Net of tax 403 (672) 2,885 (1,994)
Securities: Less: gain (losses) recognized in income, Before tax 1 (10) 1 (29)
Securities: Less: gain (losses) recognized in income, Tax effect   3   8
Securities: gains (losses) recognized in income, Net of tax 1 (7) 1 (21)
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax 551 (911) 3,956 (2,704)
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect (149) 246 (1,072) 731
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax 402 (665) 2,884 (1,973)
Investment Securities HTM [Member]        
Securities: Less: gain (losses) recognized in income, Before tax (82) (86) (243) (200)
Securities: Less: gain (losses) recognized in income, Tax effect 22 23 65 54
Securities: gains (losses) recognized in income, Net of tax (60) (63) (178) (146)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 82 86 243 200
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (22) (23) (65) (54)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 60 63 178 146
Pension Plan [Member]        
Unrealized net actuarial loss, Before Tax (103) 486 3,250 (1,206)
Unrealized net actuarial loss, Tax Effect 28 (132) (881) 326
Unrealized net actuarial loss, Net of Tax (75) 354 2,369 (880)
Net plan liability adjustment, Before Tax 166 788 4,057 (300)
Net plan liability adjustment, Tax Effect (45) (214) (1,100) 80
Net plan liability adjustment, Net of Tax 121 574 2,957 (220)
SERP [Member]        
Net plan liability adjustment, Before Tax 28 39 85 119
Net plan liability adjustment, Tax Effect (8) (10) (23) (32)
Net plan liability adjustment, Net of Tax 20 29 62 87
Amortization of unrecognized loss [Member] | Pension Plan [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (269) (300) (807) (900)
Less: amortization of unrecognized net gain (loss), Tax Effect 73 82 219 244
Less: amortization of unrecognized net gain (loss), Net of Tax (196) (218) (588) (656)
Amortization of unrecognized loss [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (29) (40) (87) (121)
Less: amortization of unrecognized net gain (loss), Tax Effect 8 11 23 33
Less: amortization of unrecognized net gain (loss), Net of Tax (21) (29) (64) (88)
Amortization of prior service costs [Member] | Pension Plan [Member]        
Less: amortization of prior service costs, Before Tax   (2)   (6)
Less: amortization of prior service costs, Tax Effect       2
Less: amortization of prior service costs, Net of Tax   (2)   (4)
Amortization of prior service costs [Member] | SERP [Member]        
Less: amortization of prior service costs, Before Tax 1 1 2 2
Less: amortization of prior service costs, Tax Effect   $ (1)   (1)
Less: amortization of prior service costs, Net of Tax $ 1   $ 2 $ 1