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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, 2013
Dec. 31, 2012
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile $ 1,367,042 $ 1,312,254
Residential real estate and consumer loan portfolio based on performing and nonperforming status 1,248,312 1,238,319
Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 110,779 119,447
Commercial Secured by Real Estate [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 872,542 807,213
Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 8,840 9,246
Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 374,881 376,348
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 56,075 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 697,601 696,928
Home Equity [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 84,880 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 122,215 122,581
Consumer Indirect [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 287,541 281,477
Pass [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 1,162,559 1,095,796
Pass [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 85,699 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 746,202 665,764
Pass [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 8,840 9,246
Pass [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 321,819 328,646
Watch [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 123,880 121,192
Watch [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 13,519 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 77,561 79,517
Watch [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Watch [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 32,800 28,760
OAEM [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 12,839 20,402
OAEM [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 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 6,639 16,532
OAEM [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
OAEM [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 6,200 2,816
Substandard [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 56,314 62,282
Substandard [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 7,208 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 37,334 40,021
Substandard [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Substandard [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 11,772 14,878
Doubtful [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 11,450 12,582
Doubtful [Member] | Commercial Construction [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 4,353 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 4,806 5,379
Doubtful [Member] | Commercial Other [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 0 0
Doubtful [Member] | Equipment Lease [Member]
    
Credit risk profile, segregated by class [Line Items]    
Commercial loan portfolio based on credit risk profile 2,291 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 1,236,450 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 55,381 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 687,602 689,264
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 84,127 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 122,096 122,483
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 287,244 281,096
Nonperforming [Member]
    
Credit risk profile, segregated by class [Line Items]    
Residential real estate and consumer loan portfolio based on performing and nonperforming status 11,862 [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 694 [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 9,999 [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 753 [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 119 [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 $ 297 [1] $ 381 [1]
[1] A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.