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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income     $ 331  
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect     (132)  
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax     199  
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax 5,306 (5,464) 8,342 (5,729)
Cash flow hedges: Unrealized holding gains, Before Tax 93 129 185 230
Cash flow hedges: Unrealized holding gains, Tax Effect (37) (51) (74) (92)
Cash flow hedges: Unrealized holding gains, Net of Tax 56 78 111 138
Unrealized net actuarial gain (loss), Net of Tax 164 (624) 37 91
Other comprehensive income, Before tax amount     15,262 (6,828)
Other comprehensive income, Tax (expense) benefit     (6,101) 2,743
Other comprehensive income, Net     9,161 (4,085)
Investment Securities- with OTTI AFS [Member]
        
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Before tax amount 852 830 5,401 2,618
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Tax effect (341) (333) (2,160) (1,051)
Available for sale (AFS) securities with OTTI: Unrealized holding gains, Net of tax 511 497 3,241 1,567
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income 171 139   265
Available for sale (AFS) securities with OTTI: Less: accretable yield recognized in income, Tax effect (68) (55)   (106)
Other than temporary impairment losses, investments, reclassification adjustment of noncredit portion included in net income, Available for sale securities, Net of tax 103 84   159
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Before tax amount 681 691 5,070 2,353
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI: Net unrealized gains on investments with OTTI, Tax effect (273) (278) (2,028) (945)
Available for sale (AFS) securities with OTTI: Net unrealized gains on investments with OTTI, Net of tax 408 413 3,042 1,408
Investment Securities -All Other AFS [Member]
        
Securities: Unrealized holding losses, Before tax 8,753 (9,154) 13,743 (9,348)
Securities: Unrealized holding losses, Tax effect (3,499) 3,677 (5,494) 3,755
Securities: Unrealized holding losses, Net of tax 5,254 (5,477) 8,249 (5,593)
Securities: Less: gains recognized in income, Before tax (86) (23) (154) 227
Securities: Less: gains recognized in income, Tax effect 34 10 61 (91)
Securities: gains recognized in income, Net of tax (52) (13) (93) 136
Available for sale securities: Net unrealized losses on all other AFS securities, Before Tax 8,839 (9,131) 13,897 (9,575)
Available for sale securities: Net unrealized losses on all other AFS securities, Tax effect (3,533) 3,667 (5,555) 3,846
Available for sale securities - all other: Net unrealized losses on all other AFS securities, Net of tax 5,306 (5,464) 8,342 (5,729)
Investment Securities HTM [Member]
        
Securities: Unrealized holding losses, Before tax (3,984)   (3,984)  
Securities: Unrealized holding losses, Tax effect 1,593   1,593  
Securities: Unrealized holding losses, Net of tax (2,391)   (2,391)  
Securities: Less: gains recognized in income, Before tax (32)   (32)  
Securities: Less: gains recognized in income, Tax effect 13   13  
Securities: gains recognized in income, Net of tax (19)   (19)  
Held to maturity securities: Net unrealized losses on all HTM securities, Before tax (3,952)   (3,952)  
Held to maturity securities: Net unrealized losses on all HTM securities, Tax 1,580   1,580  
Held to maturity securities: Net unrealized losses on all HTM securities, After tax (2,372)   (2,372)  
Pension Plan [Member]
        
Unrealized net actuarial gain (loss), Before Tax 186 (1,169) (112) (100)
Unrealized net actuarial gain (loss), Tax Effect (74) 469 45 39
Unrealized net actuarial gain (loss), Net of Tax 112 (700) (67) (61)
Less: amortization of unrecognized net gain (loss), Before Tax (94) (133)    
Less: amortization of unrecognized net gain (loss), Tax Effect 38 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 273 (1,043) 61 152
Net plan liability adjustment, Tax Effect (109) 419 (24) (61)
Net plan liability adjustment, Net of Tax 164 (624) 37 91
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 5 (1)    
Less: amortization of unrecognized net gain (loss), Tax Effect (1) 0    
Less: amortization of unrecognized net gain (loss), Net of Tax 4 (1)    
Less: amortization of prior service costs, Before Tax (5) (5)    
Less: amortization of prior service costs, Tax Effect 1 3    
Less: amortization of prior service costs, Net of Tax (4) (2)    
Net plan liability adjustment, Before Tax 0 6 1 12
Net plan liability adjustment, Tax Effect 0 (3) 0 (5)
Net plan liability adjustment, Net of Tax 0 3 1 7
Other comprehensive income, Before tax amount 5,934 (9,348)    
Other comprehensive income, Tax (expense) benefit (2,372) 3,754    
Other comprehensive income, Net 3,562 (5,594)    
Amortization of Unrecognized Loss [Member] | Pension Plan [Member]
        
Less: amortization of unrecognized net gain (loss), Before Tax     (187) (266)
Less: amortization of unrecognized net gain (loss), Tax Effect     75 106
Less: amortization of unrecognized net gain (loss), Net of Tax     (112) (160)
Amortization of Unrecognized Loss [Member] | SERP [Member]
        
Less: amortization of unrecognized net gain (loss), Before Tax       (2)
Less: amortization of unrecognized net gain (loss), Tax Effect       1
Less: amortization of unrecognized net gain (loss), Net of Tax       (1)
Amortization of Unrecognized Gain [Member] | SERP [Member]
        
Less: amortization of unrecognized net gain (loss), Before Tax     9  
Less: amortization of unrecognized net gain (loss), Tax Effect     (4)  
Less: amortization of unrecognized net gain (loss), Net of Tax     5  
Amortization of transition asset [Member] | Pension Plan [Member]
        
Less: amortization of transition asset, Before Tax     20 20
Less: amortization of transition asset, Tax Effect     (8) (8)
Less: amortization of transition asset, Net of Tax     12 12
Amortization of prior service costs [Member] | Pension Plan [Member]
        
Less: amortization of prior service costs, Before Tax     (6) (6)
Less: amortization of prior service costs, Tax Effect     2 2
Less: amortization of prior service costs, Net of Tax     (4) (4)
Amortization of prior service costs [Member] | SERP [Member]
        
Less: amortization of prior service costs, Before Tax     (10) (10)
Less: amortization of prior service costs, Tax Effect     4 4
Less: amortization of prior service costs, Net of Tax     $ (6) $ (6)