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Allowance for Loan Losses Risk Ratings by Segment (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | $ 376,718 | $ 369,639 | $ 390,187
Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 251,799 | 251,335 | 253,193
Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 18,641 | 22,417 | 33,072
Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 91,393 | 81,183 | 87,833
Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 14,885 | 14,704 | 16,089
Strong 1 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,863 | 2,021 | 2,127
Strong 1 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 18 | 19 | 21
Strong 1 [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
Strong 1 [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 255 | 271 | 284
Strong 1 [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,590 | 1,731 | 1,822
Above Average 2 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 27,393 | 26,290 | 32,023
Above Average 2 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 12,914 | 13,871 | 19,319
Above Average 2 [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 569 | 1,274 | 170
Above Average 2 [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 6,135 | 4,084 | 4,601
Above Average 2 [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 7,775 | 7,061 | 7,933
Satisfactory 3 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 63,493 | 54,831 | 55,269
Satisfactory 3 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 39,155 | 34,454 | 36,207
Satisfactory 3 [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 2,716 | 2,312 | 1,751
Satisfactory 3 [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 17,439 | 14,578 | 13,541
Satisfactory 3 [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 4,183 | 3,487 | 3,770
Average 4 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 147,480 | 143,077 | 156,051
Average 4 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 102,063 | 99,712 | 99,855
Average 4 [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 10,963 | 12,322 | 20,932
Average 4 [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 33,117 | 28,618 | 32,700
Average 4 [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,337 | 2,425 | 2,564
Watch 5 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 55,224 | 64,614 | 64,205
Watch 5 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 39,466 | 43,369 | 41,089
Watch 5 [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 42 | 1,721 | 1,969
Watch 5 [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 15,716 | 19,524 | 21,147
Watch 5 [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
OAEM 6 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 31,462 | 31,681 | 27,141
OAEM 6 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 24,265 | 26,302 | 21,135
OAEM 6 [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 3,001 | 79 | 1,649
OAEM 6 [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 4,196 | 5,300 | 4,357
OAEM 6 [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 49,388 | 46,668 | 52,643
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 33,503 | 33,153 | 34,931
Substandard [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,350 | 4,709 | 6,601
Substandard [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 14,535 | 8,806 | 11,111
Substandard [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 415 | 457 | 728
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 415 | 455 | 636
Doubtful [Member] | Commercial Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
Doubtful [Member] | Commercial Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 2 | 92
Doubtful [Member] | Municipal [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | $ 0 | $ 0 | $ 0

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- Definition Loans subject to review and validation annually by independent consulting firm as well internal credit review function. + References No definition available. + Details
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