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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, 2014
Dec. 31, 2013
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile $ 1,382,288 $ 1,367,042
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,250,321 1,248,312
Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 113,420 110,779
Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 905,996 872,542
Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 7,928 8,840
Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 354,944 374,881
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 61,184 56,075
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 698,403 697,601
Home Equity [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 87,279 84,880
Consumer Direct [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 119,610 122,215
Consumer Indirect [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 283,845 287,541
Pass [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,189,907 1,162,559
Pass [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 92,911 85,699
Pass [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 783,366 746,202
Pass [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 7,928 8,840
Pass [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 305,702 321,819
Watch [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 114,502 123,880
Watch [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 9,179 13,519
Watch [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 73,612 77,561
Watch [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Watch [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 31,711 32,800
OAEM [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 13,201 12,839
OAEM [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,106 0
OAEM [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 11,007 6,639
OAEM [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
OAEM [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,088 6,200
Substandard [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 46,477 56,314
Substandard [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 5,705 7,208
Substandard [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 26,476 37,334
Substandard [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Substandard [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 14,296 11,772
Doubtful [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 18,201 11,450
Doubtful [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 4,519 4,353
Doubtful [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 11,535 4,806
Doubtful [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Doubtful [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 2,147 2,291
Performing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,236,430 1,236,450
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 60,480 55,381
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 686,637 687,602
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 86,281 84,127
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 119,531 122,096
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 283,501 287,244
Nonperforming [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 13,891 [1] 11,862 [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 704 [1] 694 [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 11,766 [1] 9,999 [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 998 [1] 753 [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 79 [1] 119 [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 $ 344 [1] $ 297 [1]
[1] A loan is considered nonperforming if it is 90 days or more past due and/or on nonaccrual.