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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax $ (87) $ (640) $ 8,255 $ (6,369)
Cash flow hedges: Unrealized holding gains, Before Tax 44 71 229 301
Cash flow hedges: Unrealized holding gains, Tax Effect (18) (29) (92) (121)
Cash flow hedges: Unrealized holding gains, Net of Tax 26 42 137 180
Unrealized net actuarial gain (loss), Net of Tax (687) 434 (650) 525
Other comprehensive income, Before tax amount (573) 473 14,689 (6,354)
Other comprehensive income, Tax (expense) benefit 228 (189) (5,873) 2,553
Other comprehensive income, Net (345) 284 8,816 (3,801)
Investment Securities- with OTTI AFS [Member]
        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount 748 882 6,149 3,500
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect (300) (354) (2,460) (1,405)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax 448 528 3,689 2,095
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income 170 140 501 406
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (68) (56) (200) (163)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 102 84 301 243
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount 578 742 5,648 3,094
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI: Net unrealized gains on investments with OTTI, Tax effect (232) (298) (2,260) (1,242)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax 346 444 3,388 1,852
Investment Securities -All Other AFS [Member]
        
Securities: Unrealized holding losses, Before tax 3 (1,174) 13,746 (10,520)
Securities: Unrealized holding losses, Tax effect (2) 472 (5,496) 4,225
Securities: Unrealized holding losses, Net of tax 1 (702) 8,250 (6,295)
Securities: Less: gains recognized in income, Before tax 147 (103) (7) 124
Securities: Less: gains recognized in income, Tax effect (59) 41 2 (50)
Securities: gains recognized in income, Net of tax 88 (62) (5) 74
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax (144) (1,071) 13,753 (10,644)
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect 57 431 (5,498) 4,275
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax (87) (640) 8,255 (6,369)
Investment Securities HTM [Member]
        
Securities: Unrealized holding losses, Before tax 0   (3,984)  
Securities: Unrealized holding losses, Tax effect 0   1,593  
Securities: Unrealized holding losses, Net of tax 0   (2,391)  
Securities: Less: gains recognized in income, Before tax (95)   (127)  
Securities: Less: gains recognized in income, Tax effect 38   51  
Securities: gains recognized in income, Net of tax (57)   (76)  
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax 95   (3,857)  
Held to maturity securities: Net unrealized losses on all HTM securities, Tax (38)   1,542  
Held to maturity securities: Net unrealized losses on all HTM securities, After tax 57   (2,315)  
Pension Plan [Member]
        
Unrealized net actuarial gain (loss), Before Tax (1,233) 599 (1,345) 499
Unrealized net actuarial gain (loss), Tax Effect 494 (241) 539 (200)
Unrealized net actuarial gain (loss), Net of Tax (739) 358 (806) 299
Less: amortization of unrecognized net gain (loss), Before Tax (93) (133)    
Less: amortization of unrecognized net gain (loss), Tax Effect 37 53    
Less: amortization of unrecognized net gain (loss), Net of Tax (56) (80)    
Less: amortization of transition asset, Before Tax 10 10    
Less: amortization of transition asset, Tax Effect (4) (4)    
Less: amortization of transition asset, Net of Tax 6 6    
Less: amortization of prior service costs, Before Tax (3) (3)    
Less: amortization of prior service costs, Tax Effect 1 1    
Less: amortization of prior service costs, Net of Tax (2) (2)    
Net plan liability adjustment, Before Tax (1,147) 725 (1,086) 877
Net plan liability adjustment, Tax Effect 460 (291) 436 (352)
Net plan liability adjustment, Net of Tax (687) 434 (650) 525
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 4 (1)    
Less: amortization of unrecognized net gain (loss), Tax Effect (1) 0    
Less: amortization of unrecognized net gain (loss), Net of Tax 3 (1)    
Less: amortization of prior service costs, Before Tax (5) (5)    
Less: amortization of prior service costs, Tax Effect 2 2    
Less: amortization of prior service costs, Net of Tax (3) (3)    
Net plan liability adjustment, Before Tax 1 6 2 18
Net plan liability adjustment, Tax Effect (1) (2) (1) (7)
Net plan liability adjustment, Net of Tax 0 4 1 11
Amortization of Unrecognized Loss [Member] | Pension Plan [Member]
        
Less: amortization of unrecognized net gain (loss), Before Tax     (280) (399)
Less: amortization of unrecognized net gain (loss), Tax Effect     112 160
Less: amortization of unrecognized net gain (loss), Net of Tax     (168) (239)
Amortization of Unrecognized Loss [Member] | SERP [Member]
        
Less: amortization of unrecognized net gain (loss), Before Tax       (3)
Less: amortization of unrecognized net gain (loss), Tax Effect       1
Less: amortization of unrecognized net gain (loss), Net of Tax       (2)
Amortization of Unrecognized Gain [Member] | SERP [Member]
        
Less: amortization of unrecognized net gain (loss), Before Tax     13  
Less: amortization of unrecognized net gain (loss), Tax Effect     (5)  
Less: amortization of unrecognized net gain (loss), Net of Tax     8  
Amortization of transition asset [Member] | Pension Plan [Member]
        
Less: amortization of transition asset, Before Tax     30 30
Less: amortization of transition asset, Tax Effect     (12) (12)
Less: amortization of transition asset, Net of Tax     18 18
Amortization of prior service costs [Member] | Pension Plan [Member]
        
Less: amortization of prior service costs, Before Tax     (9) (9)
Less: amortization of prior service costs, Tax Effect     3 4
Less: amortization of prior service costs, Net of Tax     (6) (5)
Amortization of prior service costs [Member] | SERP [Member]
        
Less: amortization of prior service costs, Before Tax     (15) (15)
Less: amortization of prior service costs, Tax Effect     6 6
Less: amortization of prior service costs, Net of Tax     $ (9) $ (9)