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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.

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