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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
Sep. 30, 2013
Dec. 31, 2012
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile $ 1,371,741 $ 1,312,254
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,244,624 1,238,319
Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 107,940 119,447
Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 877,935 807,213
Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 9,380 9,246
Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 376,486 376,348
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 53,545 55,041
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 693,809 696,928
Home Equity [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 82,498 82,292
Consumer Direct [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 123,960 122,581
Consumer Indirect [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 290,812 281,477
Pass [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,153,752 1,095,796
Pass [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 82,682 92,140
Pass [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 744,360 665,764
Pass [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 9,380 9,246
Pass [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 317,330 328,646
Watch [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 131,592 121,192
Watch [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 13,832 12,915
Watch [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 82,256 79,517
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 35,504 28,760
OAEM [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 20,647 20,402
OAEM [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 10 1,054
OAEM [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 11,696 16,532
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 8,941 2,816
Substandard [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 53,512 62,282
Substandard [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 6,859 7,383
Substandard [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 34,313 40,021
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 12,340 14,878
Doubtful [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 12,238 12,582
Doubtful [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 4,557 5,955
Doubtful [Member] | Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 5,310 5,379
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 2,371 1,248
Performing [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,234,356 1,229,083
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 52,889 54,530
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 685,455 689,264
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 81,802 81,710
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 123,815 122,483
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 290,395 281,096
Nonperforming [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 10,268 [1] 9,236 [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 656 [1] 511 [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 8,354 [1] 7,664 [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 696 [1] 582 [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 145 [1] 98 [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 $ 417 [1] $ 381 [1]
[1] A loan is considered nonperforming if it is 90 days or more past due and/or on nonaccrual.