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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