Allowance for Loan Losses Risk Ratings by Segment (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 |
In Thousands, unless otherwise specified |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | $376,939 | $380,731 | $372,161 |
Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 240,187 | 245,943 | 250,180 |
Commercial Construction [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 21,686 | 20,382 | 17,090 |
Commercial Other [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 97,276 | 95,289 | 89,874 |
Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 17,790 | 19,117 | 15,017 |
Substandard [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 35,848 | 41,532 | 50,039 |
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 23,576 | 27,115 | 34,530 |
Substandard [Member] | Commercial Construction [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 777 | 795 | 1,881 |
Substandard [Member] | Commercial Other [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 11,495 | 13,622 | 13,628 |
Substandard [Member] | Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
Above Average 2 [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 33,444 | 38,318 | 26,410 |
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 | 9,287 | 14,565 | 12,288 |
Above Average 2 [Member] | Commercial Construction [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 773 | 804 | 271 |
Above Average 2 [Member] | Commercial Other [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 7,458 | 6,719 | 6,262 |
Above Average 2 [Member] | Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 15,926 | 16,230 | 7,589 |
Average 4 [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 165,196 | 161,073 | 148,260 |
Average 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 102,361 | 100,343 | 103,957 |
Average 4 [Member] | Commercial Construction [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 16,388 | 14,938 | 9,505 |
Average 4 [Member] | Commercial Other [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 46,447 | 45,792 | 32,430 |
Average 4 [Member] | Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 2,368 |
Satisfactory 3 [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 64,726 | 63,823 | 58,862 |
Satisfactory 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 44,918 | 45,213 | 36,187 |
Satisfactory 3 [Member] | Commercial Construction [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 1,080 | 871 | 2,410 |
Satisfactory 3 [Member] | Commercial Other [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 16,864 | 14,852 | 16,846 |
Satisfactory 3 [Member] | Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 1,864 | 2,887 | 3,419 |
Doubtful [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 40 | 625 | 441 |
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 0 | 263 | 439 |
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 | 40 | 362 | 2 |
Doubtful [Member] | Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
Strong 1 [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 276 | 281 | 1,919 |
Strong 1 [Member] | Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 15 | 16 | 19 |
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 | 261 | 265 | 259 |
Strong 1 [Member] | Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 1,641 |
Watch 5 [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 43,907 | 42,791 | 53,404 |
Watch 5 [Member] | Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 33,079 | 32,326 | 37,703 |
Watch 5 [Member] | Commercial Construction [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 0 | 26 | 22 |
Watch 5 [Member] | Commercial Other [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 10,828 | 10,439 | 15,679 |
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 | 33,502 | 32,288 | 32,826 |
OAEM 6 [Member] | Commercial Real Estate Portfolio Segment [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 26,951 | 26,102 | 25,057 |
OAEM 6 [Member] | Commercial Construction [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 2,668 | 2,948 | 3,001 |
OAEM 6 [Member] | Commercial Other [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | 3,883 | 3,238 | 4,768 |
OAEM 6 [Member] | Municipal [Member] | ' | ' | ' |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | ' | ' |
Commercial and municipal risk-rated loans receivable | $0 | $0 | $0 |