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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (1,078) $ 78
Cash flow hedges: Unrealized holding gains, Before Tax 607 86
Cash flow hedges: Unrealized holding gains, Tax Effect (164) (34)
Cash flow hedges: Unrealized holding gains, Net of Tax 443 52
Unrealized net actuarial gain (loss), Net of Tax 736 194
Other comprehensive income, Before tax amount 1,138 838
Other comprehensive income, Tax (expense) benefit (318) (333)
Other comprehensive income, Net 820 505
Investment securities- with OTTI [Member]    
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount 939 166
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect (254) (66)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax 685 100
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income 55 2
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (15) 0
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 40 2
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount 884 164
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Tax effect (239) (66)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax 645 98
Investment Securities -All Other AFS [Member]    
Securities: Unrealized holding losses, Before tax (1,487) 122
Securities: Unrealized holding losses, Tax effect 402 (49)
Securities: Unrealized holding losses, Net of tax (1,085) 73
Securities: Less: gains recognized in income, Before tax (9) (9)
Securities: Less: gains recognized in income, Tax effect 2 4
Securities: gains recognized in income, Net of tax (7) (5)
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax (1,478) 131
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect 400 (53)
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax (1,078) 78
Investment Securities HTM [Member]    
Securities: Unrealized holding losses, Before tax 0 0
Securities: Unrealized holding losses, Tax effect 0 0
Securities: Unrealized holding losses, Net of tax 0 0
Securities: Less: gains recognized in income, Before tax (76) (101)
Securities: Less: gains recognized in income, Tax effect 31 40
Securities: gains recognized in income, Net of tax (45) (61)
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 76 101
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (31) (40)
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 45 61
Pension Plan [Member]    
Unrealized net actuarial gain (loss), Before Tax 707 53
Unrealized net actuarial gain (loss), Tax Effect (191) (21)
Unrealized net actuarial gain (loss), Net of Tax 516 32
Net plan liability adjustment, Before Tax 1,009 320
Net plan liability adjustment, Tax Effect (273) (126)
Net plan liability adjustment, Net of Tax 736 194
SERP [Member]    
Unrealized net actuarial gain (loss), Before Tax 0 0
Unrealized net actuarial gain (loss), Tax Effect 0 0
Unrealized net actuarial gain (loss), Net of Tax 0 0
Net plan liability adjustment, Before Tax 40 36
Net plan liability adjustment, Tax Effect (11) (14)
Net plan liability adjustment, Net of Tax 29 22
Amortization of unrecognized loss [Member] | Pension Plan [Member]    
Less: amortization of unrecognized net gain (loss), Before Tax (300) (264)
Less: amortization of unrecognized net gain (loss), Tax Effect 81 105
Less: amortization of unrecognized net gain (loss), Net of Tax (219) (159)
Amortization of Unrecognized Gain [Member] | SERP [Member]    
Less: amortization of unrecognized net gain (loss), Before Tax (41) (37)
Less: amortization of unrecognized net gain (loss), Tax Effect 11 14
Less: amortization of unrecognized net gain (loss), Net of Tax (30) (23)
Amortization of transition asset [Member] | Pension Plan [Member]    
Less: amortization of transition asset, Before Tax 0 0
Less: amortization of transition asset, Tax Effect 0 0
Less: amortization of transition asset, Net of Tax 0 0
Amortization of prior service costs [Member] | Pension Plan [Member]    
Less: amortization of prior service costs, Before Tax (2) (3)
Less: amortization of prior service costs, Tax Effect 1 0
Less: amortization of prior service costs, Net of Tax (1) (3)
Amortization of prior service costs [Member] | SERP [Member]    
Less: amortization of prior service costs, Before Tax 1 1
Less: amortization of prior service costs, Tax Effect 0 0
Less: amortization of prior service costs, Net of Tax $ 1 $ 1