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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ 1,708 $ (181) $ 1,786 $ 253
Cash flow hedges: Unrealized holding gains, Before Tax (249) (509) (163) (1,060)
Cash flow hedges: Unrealized holding gains, Tax Effect 99 203 65 423
Cash flow hedges: Unrealized holding gains, Net of Tax (150) (306) (98) (637)
Unrealized net actuarial gain (loss), Net of Tax 2 (82) 196 (295)
Other comprehensive income, Before tax amount 2,593 1,309 3,431 (146)
Other comprehensive income, Tax (expense) benefit (1,035) (523) (1,368) 59
Other comprehensive income, Net 1,558 786 2,063 (87)
Investment securities- with OTTI [Member]        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount (56) 1,829 110 333
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect 23 (730) (44) (133)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax (33) 1,099 66 200
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income 55 (31) 57 5
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (22) 12 (23) (2)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 33 (19) 34 3
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount (111) 1,860 53 328
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect 45 (742) (21) (131)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax (66) 1,118 32 197
Investment Securities -All Other AFS [Member]        
Securities: Unrealized holding losses, Before tax 2,832 (282) 2,954 647
Securities: Unrealized holding losses, Tax effect (1,129) 113 (1,178) (258)
Securities: Unrealized holding losses, Net of tax 1,703 (169) 1,776 389
Securities: Less: gains recognized in income, Before tax (8) 21 (17) 227
Securities: Less: gains recognized in income, Tax effect 3 (9) 7 (91)
Securities: gains recognized in income, Net of tax (5) 12 (10) 136
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax 2,840 (303) 2,971 420
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect (1,132) 122 (1,185) (167)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax 1,708 (181) 1,786 253
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 (71) (371) (172) (608)
Securities: Less: gains recognized in income, Tax effect 28 149 68 243
Securities: gains recognized in income, Net of tax (43) (222) (104) (365)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 71 371 172 608
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (28) (149) (68) (243)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 43 222 104 365
Pension Plan [Member]        
Unrealized net actuarial gain (loss), Before Tax (261) (350) (208) (921)
Unrealized net actuarial gain (loss), Tax Effect 103 140 82 368
Unrealized net actuarial gain (loss), Net of Tax (158) (210) (126) (553)
Net plan liability adjustment, Before Tax 6 (135) 326 (491)
Net plan liability adjustment, Tax Effect (4) 53 (130) 196
Net plan liability adjustment, Net of Tax 2 (82) 196 (295)
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 72 49
Net plan liability adjustment, Tax Effect (15) (10) (29) (19)
Net plan liability adjustment, Net of Tax 21 15 43 30
Amortization of unrecognized loss [Member] | Pension Plan [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (264) (212) (528) (424)
Less: amortization of unrecognized net gain (loss), Tax Effect 105 85 210 170
Less: amortization of unrecognized net gain (loss), Net of Tax (159) (127) (318) (254)
Amortization of unrecognized loss [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (36)      
Less: amortization of unrecognized net gain (loss), Tax Effect 15      
Less: amortization of unrecognized net gain (loss), Net of Tax (21)      
Amortization of Unrecognized Gain [Member] | SERP [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax     (73) (39)
Less: amortization of unrecognized net gain (loss), Tax Effect     29 15
Less: amortization of unrecognized net gain (loss), Net of Tax     (44) (24)
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) (6) (6)
Less: amortization of prior service costs, Tax Effect 2 2 2 2
Less: amortization of prior service costs, Net of Tax (1) $ (1) (4) (4)
Amortization of prior service costs [Member] | SERP [Member]        
Less: amortization of prior service costs, Before Tax 0   1 (10)
Less: amortization of prior service costs, Tax Effect 0   0 4
Less: amortization of prior service costs, Net of Tax $ 0   $ 1 $ (6)