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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, 2012 | Dec. 31, 2011
--- | --- | ---
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | $ 1,325,491 |  | $ 1,303,767 |
Residential real estate and consumer loan portfolio based on performing and nonperforming status | 1,226,046 |  | 1,252,781 |
Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 115,091 |  | 120,577 |
Commercial Secured By Real Estate [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 820,925 |  | 798,887 |
Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 379,308 |  | 374,597 |
Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 10,167 |  | 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 | 54,431 |  | 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 | 664,329 |  | 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 | 82,724 |  | 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 | 126,005 |  | 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 | 298,557 |  | 340,382 |
Pass [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,091,036 |  | 1,062,375 |
Pass [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 86,482 |  | 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 | 672,486 |  | 643,312 |
Pass [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 321,901 |  | 323,471 |
Pass [Member] | Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 10,167 |  | 9,706 |
Watch [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 133,364 |  | 134,517 |
Watch [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 13,041 |  | 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 | 80,318 |  | 78,611 |
Watch [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 40,005 |  | 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 | 24,958 |  | 24,134 |
OAEM [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,067 |  | 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 | 19,798 |  | 21,087 |
OAEM [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 4,093 |  | 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 | 61,977 |  | 62,385 |
Substandard [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 7,301 |  | 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 | 42,792 |  | 46,238 |
Substandard [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 11,884 |  | 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 | 14,156 |  | 20,356 |
Doubtful [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 7,200 |  | 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 | 5,531 |  | 9,639 |
Doubtful [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,425 |  | 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 | 1,217,627 |  | 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 | 53,824 |  | 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 | 657,635 |  | 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 | 82,114 |  | 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 | 125,896 |  | 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 | 298,158 |  | 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 | 8,419 | [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 | 607 | [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 | 6,694 | [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 | 610 | [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 | 109 | [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 | $ 399 | [1] | $ 483 | [1]
[1] | A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.

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