Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (181) $ (12) $ 253 $ 667
Cash flow hedges: Unrealized holding gains, Before Tax (509) 24 (1,060) 59
Cash flow hedges: Unrealized holding gains, Tax Effect 203 (10) 423 (24)
Cash flow hedges: Unrealized holding gains, Net of Tax (306) 14 (637) 35
Unrealized net actuarial gain (loss), Net of Tax (82) (746) (295) (836)
Other comprehensive income, Before tax amount 1,309 1,005 (146) 4,763
Other comprehensive income, Tax (expense) benefit (523) (401) 59 (1,899)
Other comprehensive income, Net 786 604 (87) 2,864
Investment securities- with OTTI [Member]        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount 1,829 2,246 333 5,024
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect (730) (896) (133) (2,004)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax 1,099 1,350 200 3,020
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income (31) 173 5 340
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect 12 (69) (2) (136)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax (19) 104 3 204
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount 1,860 2,073 328 4,684
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect (742) (827) (131) (1,868)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax 1,118 1,246 197 2,816
Investment Securities -All Other AFS [Member]        
Securities: Unrealized holding losses, Before tax (282) 60 647 1,092
Securities: Unrealized holding losses, Tax effect 113 (24) (258) (435)
Securities: Unrealized holding losses, Net of tax (169) 36 389 657
Securities: Less: gains recognized in income, Before tax 21 80 227 (17)
Securities: Less: gains recognized in income, Tax effect (9) (32) (91) 7
Securities: gains recognized in income, Net of tax 12 48 136 (10)
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax (303) (20) 420 1,109
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect 122 8 (167) (442)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax (181) (12) 253 667
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 (371) (152) (608) (268)
Securities: Less: gains recognized in income, Tax effect 149 61 243 107
Securities: gains recognized in income, Net of tax (222) (91) (365) (161)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 371 152 608 268
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (149) (61) (243) (107)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 222 91 365 161
Pension Plan [Member]        
Unrealized net actuarial gain (loss), Before Tax (350) (1,425) (921) (1,759)
Unrealized net actuarial gain (loss), Tax Effect 140 569 368 701
Unrealized net actuarial gain (loss), Net of Tax (210) (856) (553) (1,058)
Net plan liability adjustment, Before Tax (135) (1,241) (491) (1,391)
Net plan liability adjustment, Tax Effect 53 495 196 555
Net plan liability adjustment, Net of Tax (82) (746) (295) (836)
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 17 49 34
Net plan liability adjustment, Tax Effect (10) (6) (19) (13)
Net plan liability adjustment, Net of Tax 15 11 30 21
Amortization of unrecognized loss [Member] | Pension Plan [Member]        
Less: amortization of unrecognized net gain (loss), Before Tax (212) (186) (424) (372)
Less: amortization of unrecognized net gain (loss), Tax Effect 85 74 170 148
Less: amortization of unrecognized net gain (loss), Net of Tax (127) (112) (254) (224)
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   (12) (39) (24)
Less: amortization of unrecognized net gain (loss), Tax Effect   5 15 10
Less: amortization of unrecognized net gain (loss), Net of Tax   (7) (24) (14)
Amortization of transition asset [Member] | Pension Plan [Member]        
Less: amortization of transition asset, Before Tax 0 5 0 10
Less: amortization of transition asset, Tax Effect 0 (2) 0 (4)
Less: amortization of transition asset, Net of Tax 0 3 0 6
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 (5) (5) (10) (10)
Less: amortization of prior service costs, Tax Effect 3 1 4 3
Less: amortization of prior service costs, Net of Tax $ (2) $ (4) $ (6) $ (7)