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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, 2013 | Dec. 31, 2012
--- | --- | ---
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | $ 1,349,111 |  | $ 1,312,254 |
Residential real estate and consumer loan portfolio based on performing and nonperforming status | 1,235,690 |  | 1,238,319 |
Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 103,800 |  | 119,447 |
Commercial Secured by Real Estate [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 859,022 |  | 807,213 |
Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 376,906 |  | 376,348 |
Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 9,383 |  | 9,246 |
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 | 51,462 |  | 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 | 692,934 |  | 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 | 80,631 |  | 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 | 123,565 |  | 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 | 287,098 |  | 281,477 |
Pass [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,128,140 |  | 1,095,796 |
Pass [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 77,966 |  | 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 | 725,401 |  | 665,764 |
Pass [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 315,390 |  | 328,646 |
Pass [Member] | Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 9,383 |  | 9,246 |
Watch [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 132,863 |  | 121,192 |
Watch [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 13,938 |  | 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 | 79,507 |  | 79,517 |
Watch [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 39,418 |  | 28,760 |
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 | 18,157 |  | 20,402 |
OAEM [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 28 |  | 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 | 12,764 |  | 16,532 |
OAEM [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 5,365 |  | 2,816 |
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 | 56,794 |  | 62,282 |
Substandard [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 7,213 |  | 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 | 35,179 |  | 40,021 |
Substandard [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 14,402 |  | 14,878 |
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 | 13,157 |  | 12,582 |
Doubtful [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 4,655 |  | 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 | 6,171 |  | 5,379 |
Doubtful [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 2,331 |  | 1,248 |
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 | 1,226,173 |  | 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 | 50,661 |  | 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 | 685,226 |  | 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 | 80,008 |  | 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 | 123,492 |  | 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 | 286,786 |  | 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 | 9,517 | [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 | 801 | [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 | 7,708 | [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 | 623 | [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 | 73 | [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 | $ 312 | [1] | $ 381 | [1]
[1] | A loan is considered nonperforming if it is 90 days or more past due and/or on nonaccrual.

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