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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, 2012 | Dec. 31, 2011
--- | --- | ---
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | $ 1,312,254 |  | $ 1,303,767 |
Residential real estate and consumer loan portfolio based on performing and nonperforming status | 1,238,319 |  | 1,252,781 |
Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 119,447 |  | 120,577 |
Commercial Secured by Real Estate [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 807,213 |  | 798,887 |
Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 376,348 |  | 374,597 |
Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 9,246 |  | 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 | 55,041 |  | 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 | 696,928 |  | 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 | 82,292 |  | 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 | 122,581 |  | 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 | 281,477 |  | 340,382 |
Pass [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,095,796 |  | 1,062,375 |
Pass [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 92,140 |  | 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 | 665,764 |  | 643,312 |
Pass [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 328,646 |  | 323,471 |
Pass [Member] | Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 9,246 |  | 9,706 |
Watch [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 121,192 |  | 134,517 |
Watch [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 12,915 |  | 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 | 79,517 |  | 78,611 |
Watch [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 28,760 |  | 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 | 20,402 |  | 24,134 |
OAEM [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,054 |  | 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 | 16,532 |  | 21,087 |
OAEM [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 2,816 |  | 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 | 62,282 |  | 62,385 |
Substandard [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 7,383 |  | 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 | 40,021 |  | 46,238 |
Substandard [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 14,878 |  | 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 | 12,582 |  | 20,356 |
Doubtful [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 5,955 |  | 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 | 5,379 |  | 9,639 |
Doubtful [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,248 |  | 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 | 1,229,083 |  | 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 | 54,530 |  | 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 | 689,264 |  | 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 | 81,710 |  | 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 | 122,483 |  | 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 | 281,096 |  | 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 | 9,236 | [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 | 511 | [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 | 7,664 | [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 | 582 | [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 | 98 | [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 | $ 381 | [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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