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Loans, Credit Risk Profile Based on Rating Category and Payment Activity and on Performing and Nonperforming Status, Segregated by Class (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile $ 1,322,943 $ 1,303,767
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,224,493 1,252,781
Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 115,967 120,577
Commercial Secured By Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 814,625 798,887
Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 381,637 374,597
Equipment Lease Financing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 10,714 9,706
Real Estate Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 56,451 53,534
Real Estate Mortgage [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 647,834 650,075
Home Equity [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 83,101 84,841
Consumer Direct [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 124,946 123,949
Consumer Indirect [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 312,161 340,382
Pass [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,082,147 1,062,375
Pass [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 85,325 85,886
Pass [Member] | Commercial Secured By Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 663,123 643,312
Pass [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 322,985 323,471
Pass [Member] | Equipment Lease Financing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 10,714 9,706
Watch [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 133,110 134,517
Watch [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 13,133 17,721
Watch [Member] | Commercial Secured By Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 79,377 78,611
Watch [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 40,600 38,185
Watch [Member] | Equipment Lease Financing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
OAEM [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 33,055 24,134
OAEM [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,428 1,379
OAEM [Member] | Commercial Secured By Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 22,915 21,087
OAEM [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 8,712 1,668
OAEM [Member] | Equipment Lease Financing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Substandard [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 57,975 62,385
Substandard [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 7,589 8,783
Substandard [Member] | Commercial Secured By Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 42,583 46,238
Substandard [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 7,803 7,364
Substandard [Member] | Equipment Lease Financing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Doubtful [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 16,656 20,356
Doubtful [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 8,492 6,808
Doubtful [Member] | Commercial Secured By Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 6,627 9,639
Doubtful [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,537 3,909
Doubtful [Member] | Equipment Lease Financing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Performing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,216,593 1,244,146
Performing [Member] | Real Estate Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 55,709 52,911
Performing [Member] | Real Estate Mortgage [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 641,631 643,152
Performing [Member] | Home Equity [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 82,468 84,306
Performing [Member] | Consumer Direct [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 124,931 123,878
Performing [Member] | Consumer Indirect [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 311,854 339,899
Nonperforming [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 7,900 [1] 8,635 [1]
Nonperforming [Member] | Real Estate Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 742 [1] 623 [1]
Nonperforming [Member] | Real Estate Mortgage [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 6,203 [1] 6,923 [1]
Nonperforming [Member] | Home Equity [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 633 [1] 535 [1]
Nonperforming [Member] | Consumer Direct [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 15 [1] 71 [1]
Nonperforming [Member] | Consumer Indirect [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status $ 307 [1] $ 483 [1]
[1] A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.