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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
Dec. 31, 2012
Dec. 31, 2011
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile $ 1,312,254 $ 1,303,767
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,238,319 1,252,781
Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 119,447 120,577
Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 807,213 798,887
Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 376,348 374,597
Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 9,246 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 55,041 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 696,928 650,075
Home Equity [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 82,292 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 122,581 123,949
Consumer Indirect [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 281,477 340,382
Pass [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,095,796 1,062,375
Pass [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 92,140 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 665,764 643,312
Pass [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 328,646 323,471
Pass [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 9,246 9,706
Watch [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 121,192 134,517
Watch [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 12,915 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 79,517 78,611
Watch [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 28,760 38,185
Watch [Member] | Equipment Lease [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 20,402 24,134
OAEM [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,054 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 16,532 21,087
OAEM [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 2,816 1,668
OAEM [Member] | Equipment Lease [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 62,282 62,385
Substandard [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 7,383 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 40,021 46,238
Substandard [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 14,878 7,364
Substandard [Member] | Equipment Lease [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 12,582 20,356
Doubtful [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 5,955 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 5,379 9,639
Doubtful [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,248 3,909
Doubtful [Member] | Equipment Lease [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 1,229,083 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 54,530 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 689,264 643,152
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 81,710 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 122,483 123,878
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 281,096 339,899
Nonperforming [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 9,236 [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 511 [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 7,664 [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 582 [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 98 [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 $ 381 [1] $ 483 [1]
[1] A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.