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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 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | $ 1,335,463 |  | $ 1,312,254 |
Residential real estate and consumer loan portfolio based on performing and nonperforming status | 1,227,851 |  | 1,238,319 |
Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 102,303 |  | 119,447 |
Commercial Secured by Real Estate [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 847,807 |  | 807,213 |
Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 375,409 |  | 376,348 |
Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 9,944 |  | 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 | 51,978 |  | 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 | 696,321 |  | 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 | 79,899 |  | 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 | 119,191 |  | 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 | 280,462 |  | 281,477 |
Pass [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,116,073 |  | 1,095,796 |
Pass [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 74,898 |  | 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 | 704,073 |  | 665,764 |
Pass [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 327,158 |  | 328,646 |
Pass [Member] | Equipment Lease [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 9,944 |  | 9,246 |
Watch [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 129,411 |  | 121,192 |
Watch [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 14,142 |  | 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 | 85,439 |  | 79,517 |
Watch [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 29,830 |  | 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 | 14,799 |  | 20,402 |
OAEM [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 56 |  | 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 | 13,769 |  | 16,532 |
OAEM [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 974 |  | 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 | 62,734 |  | 62,282 |
Substandard [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 7,011 |  | 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 | 39,387 |  | 40,021 |
Substandard [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 16,336 |  | 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 | 12,446 |  | 12,582 |
Doubtful [Member] | Commercial Construction [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 6,196 |  | 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 | 5,139 |  | 5,379 |
Doubtful [Member] | Commercial Other [Member] |  |  |  |
Credit risk profile, segregated by class [Line Items] |  |  |  |
Commercial loan portfolio based on credit risk profile | 1,111 |  | 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 | 1,218,611 |  | 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 | 51,111 |  | 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 | 688,923 |  | 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 | 79,382 |  | 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 | 119,112 |  | 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 | 280,083 |  | 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 | 9,240 | [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 | 867 | [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 | 7,398 | [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 | 517 | [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 | 79 | [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 | $ 379 | [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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